PNG  IHDRQgAMA a cHRMz&u0`:pQ<bKGDgmIDATxwUﹻ& ^CX(J I@ "% (** BX +*i"]j(IH{~R)[~>h{}gy)I$Ij .I$I$ʊy@}x.: $I$Ii}VZPC)I$IF ^0ʐJ$I$Q^}{"r=OzI$gRZeC.IOvH eKX $IMpxsk.쒷/&r[޳<v| .I~)@$updYRa$I |M.e JaֶpSYR6j>h%IRز if&uJ)M$I vLi=H;7UJ,],X$I1AҒJ$ XY XzI@GNҥRT)E@;]K*Mw;#5_wOn~\ DC&$(A5 RRFkvIR}l!RytRl;~^ǷJj اy뷦BZJr&ӥ8Pjw~vnv X^(I;4R=P[3]J,]ȏ~:3?[ a&e)`e*P[4]T=Cq6R[ ~ޤrXR Հg(t_HZ-Hg M$ãmL5R uk*`%C-E6/%[t X.{8P9Z.vkXŐKjgKZHg(aK9ڦmKjѺm_ \#$5,)-  61eJ,5m| r'= &ڡd%-]J on Xm|{ RҞe $eڧY XYrԮ-a7RK6h>n$5AVڴi*ֆK)mѦtmr1p| q:흺,)Oi*ֺK)ܬ֦K-5r3>0ԔHjJئEZj,%re~/z%jVMڸmrt)3]J,T K֦OvԒgii*bKiNO~%PW0=dii2tJ9Jݕ{7"I P9JKTbu,%r"6RKU}Ij2HKZXJ,妝 XYrP ެ24c%i^IK|.H,%rb:XRl1X4Pe/`x&P8Pj28Mzsx2r\zRPz4J}yP[g=L) .Q[6RjWgp FIH*-`IMRaK9TXcq*I y[jE>cw%gLRԕiFCj-ďa`#e~I j,%r,)?[gp FI˨mnWX#>mʔ XA DZf9,nKҲzIZXJ,L#kiPz4JZF,I,`61%2s $,VOϚ2/UFJfy7K> X+6 STXIeJILzMfKm LRaK9%|4p9LwJI!`NsiazĔ)%- XMq>pk$-$Q2x#N ؎-QR}ᶦHZډ)J,l#i@yn3LN`;nڔ XuX5pF)m|^0(>BHF9(cզEerJI rg7 4I@z0\JIi䵙RR0s;$s6eJ,`n 䂦0a)S)A 1eJ,堌#635RIgpNHuTH_SԕqVe ` &S)>p;S$魁eKIuX`I4춒o}`m$1":PI<[v9^\pTJjriRŭ P{#{R2,`)e-`mgj~1ϣLKam7&U\j/3mJ,`F;M'䱀 .KR#)yhTq;pcK9(q!w?uRR,n.yw*UXj#\]ɱ(qv2=RqfB#iJmmL<]Y͙#$5 uTU7ӦXR+q,`I}qL'`6Kͷ6r,]0S$- [RKR3oiRE|nӦXR.(i:LDLTJjY%o:)6rxzҒqTJjh㞦I.$YR.ʼnGZ\ֿf:%55 I˼!6dKxm4E"mG_ s? .e*?LRfK9%q#uh$)i3ULRfK9yxm܌bj84$i1U^@Wbm4uJ,ҪA>_Ij?1v32[gLRD96oTaR׿N7%L2 NT,`)7&ƝL*꽙yp_$M2#AS,`)7$rkTA29_Iye"|/0t)$n XT2`YJ;6Jx".e<`$) PI$5V4]29SRI>~=@j]lp2`K9Jaai^" Ԋ29ORI%:XV5]JmN9]H;1UC39NI%Xe78t)a;Oi Ҙ>Xt"~G>_mn:%|~ޅ_+]$o)@ǀ{hgN;IK6G&rp)T2i୦KJuv*T=TOSV>(~D>dm,I*Ɛ:R#ۙNI%D>G.n$o;+#RR!.eU˽TRI28t)1LWϚ>IJa3oFbu&:tJ*(F7y0ZR ^p'Ii L24x| XRI%ۄ>S1]Jy[zL$adB7.eh4%%누>WETf+3IR:I3Xה)3אOۦSRO'ٺ)S}"qOr[B7ϙ.edG)^ETR"RtRݜh0}LFVӦDB^k_JDj\=LS(Iv─aTeZ%eUAM-0;~˃@i|l @S4y72>sX-vA}ϛBI!ݎߨWl*)3{'Y|iSlEڻ(5KtSI$Uv02,~ԩ~x;P4ցCrO%tyn425:KMlD ^4JRxSهF_}شJTS6uj+ﷸk$eZO%G*^V2u3EMj3k%)okI]dT)URKDS 7~m@TJR~荪fT"֛L \sM -0T KfJz+nإKr L&j()[E&I ߴ>e FW_kJR|!O:5/2跌3T-'|zX ryp0JS ~^F>-2< `*%ZFP)bSn"L :)+pʷf(pO3TMW$~>@~ū:TAIsV1}S2<%ޟM?@iT ,Eūoz%i~g|`wS(]oȤ8)$ ntu`өe`6yPl IzMI{ʣzʨ )IZ2= ld:5+請M$-ї;U>_gsY$ÁN5WzWfIZ)-yuXIfp~S*IZdt;t>KūKR|$#LcԀ+2\;kJ`]YǔM1B)UbG"IRߊ<xܾӔJ0Z='Y嵤 Leveg)$znV-º^3Ւof#0Tfk^Zs[*I꯳3{)ˬW4Ւ4 OdpbZRS|*I 55#"&-IvT&/윚Ye:i$ 9{LkuRe[I~_\ؠ%>GL$iY8 9ܕ"S`kS.IlC;Ҏ4x&>u_0JLr<J2(^$5L s=MgV ~,Iju> 7r2)^=G$1:3G< `J3~&IR% 6Tx/rIj3O< ʔ&#f_yXJiގNSz; Tx(i8%#4 ~AS+IjerIUrIj362v885+IjAhK__5X%nV%Iͳ-y|7XV2v4fzo_68"S/I-qbf; LkF)KSM$ Ms>K WNV}^`-큧32ŒVؙGdu,^^m%6~Nn&͓3ŒVZMsRpfEW%IwdǀLm[7W&bIRL@Q|)* i ImsIMmKmyV`i$G+R 0tV'!V)֏28vU7͒vHꦼtxꗞT ;S}7Mf+fIRHNZUkUx5SAJㄌ9MqμAIRi|j5)o*^'<$TwI1hEU^c_j?Е$%d`z cyf,XO IJnTgA UXRD }{H}^S,P5V2\Xx`pZ|Yk:$e ~ @nWL.j+ϝYb퇪bZ BVu)u/IJ_ 1[p.p60bC >|X91P:N\!5qUB}5a5ja `ubcVxYt1N0Zzl4]7­gKj]?4ϻ *[bg$)+À*x쳀ogO$~,5 زUS9 lq3+5mgw@np1sso Ӻ=|N6 /g(Wv7U;zωM=wk,0uTg_`_P`uz?2yI!b`kĸSo+Qx%!\οe|އԁKS-s6pu_(ֿ$i++T8=eY; צP+phxWQv*|p1. ά. XRkIQYP,drZ | B%wP|S5`~́@i޾ E;Չaw{o'Q?%iL{u D?N1BD!owPHReFZ* k_-~{E9b-~P`fE{AܶBJAFO wx6Rox5 K5=WwehS8 (JClJ~ p+Fi;ŗo+:bD#g(C"wA^ r.F8L;dzdIHUX݆ϞXg )IFqem%I4dj&ppT{'{HOx( Rk6^C٫O.)3:s(۳(Z?~ٻ89zmT"PLtw䥈5&b<8GZ-Y&K?e8,`I6e(֍xb83 `rzXj)F=l($Ij 2*(F?h(/9ik:I`m#p3MgLaKjc/U#n5S# m(^)=y=đx8ŬI[U]~SцA4p$-F i(R,7Cx;X=cI>{Km\ o(Tv2vx2qiiDJN,Ҏ!1f 5quBj1!8 rDFd(!WQl,gSkL1Bxg''՞^ǘ;pQ P(c_ IRujg(Wz bs#P­rz> k c&nB=q+ؔXn#r5)co*Ũ+G?7< |PQӣ'G`uOd>%Mctz# Ԫڞ&7CaQ~N'-P.W`Oedp03C!IZcIAMPUۀ5J<\u~+{9(FbbyAeBhOSܳ1 bÈT#ŠyDžs,`5}DC-`̞%r&ڙa87QWWp6e7 Rϫ/oY ꇅ Nܶըtc!LA T7V4Jsū I-0Pxz7QNF_iZgúWkG83 0eWr9 X]㾮݁#Jˢ C}0=3ݱtBi]_ &{{[/o[~ \q鯜00٩|cD3=4B_b RYb$óBRsf&lLX#M*C_L܄:gx)WΘsGSbuL rF$9';\4Ɍq'n[%p.Q`u hNb`eCQyQ|l_C>Lb꟟3hSb #xNxSs^ 88|Mz)}:](vbۢamŖ࿥ 0)Q7@0=?^k(*J}3ibkFn HjB׻NO z x}7p 0tfDX.lwgȔhԾŲ }6g E |LkLZteu+=q\Iv0쮑)QٵpH8/2?Σo>Jvppho~f>%bMM}\//":PTc(v9v!gոQ )UfVG+! 35{=x\2+ki,y$~A1iC6#)vC5^>+gǵ@1Hy٪7u;p psϰu/S <aʸGu'tD1ԝI<pg|6j'p:tպhX{o(7v],*}6a_ wXRk,O]Lܳ~Vo45rp"N5k;m{rZbΦ${#)`(Ŵg,;j%6j.pyYT?}-kBDc3qA`NWQū20/^AZW%NQ MI.X#P#,^Ebc&?XR tAV|Y.1!؅⨉ccww>ivl(JT~ u`ٵDm q)+Ri x/x8cyFO!/*!/&,7<.N,YDŽ&ܑQF1Bz)FPʛ?5d 6`kQձ λc؎%582Y&nD_$Je4>a?! ͨ|ȎWZSsv8 j(I&yj Jb5m?HWp=g}G3#|I,5v珿] H~R3@B[☉9Ox~oMy=J;xUVoj bUsl_35t-(ՃɼRB7U!qc+x4H_Qo֮$[GO<4`&č\GOc[.[*Af%mG/ ňM/r W/Nw~B1U3J?P&Y )`ѓZ1p]^l“W#)lWZilUQu`-m|xĐ,_ƪ|9i:_{*(3Gѧ}UoD+>m_?VPۅ15&}2|/pIOʵ> GZ9cmíتmnz)yߐbD >e}:) r|@R5qVSA10C%E_'^8cR7O;6[eKePGϦX7jb}OTGO^jn*媓7nGMC t,k31Rb (vyܴʭ!iTh8~ZYZp(qsRL ?b}cŨʊGO^!rPJO15MJ[c&~Z`"ѓޔH1C&^|Ш|rʼ,AwĴ?b5)tLU)F| &g٣O]oqSUjy(x<Ϳ3 .FSkoYg2 \_#wj{u'rQ>o;%n|F*O_L"e9umDds?.fuuQbIWz |4\0 sb;OvxOSs; G%T4gFRurj(֍ڑb uԖKDu1MK{1^ q; C=6\8FR艇!%\YÔU| 88m)֓NcLve C6z;o&X x59:q61Z(T7>C?gcļxѐ Z oo-08jہ x,`' ҔOcRlf~`jj".Nv+sM_]Zk g( UOPyεx%pUh2(@il0ݽQXxppx-NS( WO+轾 nFߢ3M<;z)FBZjciu/QoF 7R¥ ZFLF~#ȣߨ^<쩡ݛкvџ))ME>ώx4m#!-m!L;vv#~Y[đKmx9.[,UFS CVkZ +ߟrY٧IZd/ioi$%͝ب_ֶX3ܫhNU ZZgk=]=bbJS[wjU()*I =ώ:}-蹞lUj:1}MWm=̛ _ ¾,8{__m{_PVK^n3esw5ӫh#$-q=A̟> ,^I}P^J$qY~Q[ Xq9{#&T.^GVj__RKpn,b=`żY@^՝;z{paVKkQXj/)y TIc&F;FBG7wg ZZDG!x r_tƢ!}i/V=M/#nB8 XxЫ ^@CR<{䤭YCN)eKOSƟa $&g[i3.C6xrOc8TI;o hH6P&L{@q6[ Gzp^71j(l`J}]e6X☉#͕ ׈$AB1Vjh㭦IRsqFBjwQ_7Xk>y"N=MB0 ,C #o6MRc0|$)ف"1!ixY<B9mx `,tA>)5ػQ?jQ?cn>YZe Tisvh# GMމȇp:ԴVuږ8ɼH]C.5C!UV;F`mbBk LTMvPʍϤj?ԯ/Qr1NB`9s"s TYsz &9S%U԰> {<ؿSMxB|H\3@!U| k']$U+> |HHMLޢ?V9iD!-@x TIî%6Z*9X@HMW#?nN ,oe6?tQwڱ.]-y':mW0#!J82qFjH -`ѓ&M0u Uγmxϵ^-_\])@0Rt.8/?ٰCY]x}=sD3ojަЫNuS%U}ԤwHH>ڗjܷ_3gN q7[q2la*ArǓԖ+p8/RGM ]jacd(JhWko6ڎbj]i5Bj3+3!\j1UZLsLTv8HHmup<>gKMJj0@H%,W΃7R) ">c, xixј^ aܖ>H[i.UIHc U1=yW\=S*GR~)AF=`&2h`DzT󑓶J+?W+}C%P:|0H܆}-<;OC[~o.$~i}~HQ TvXΈr=b}$vizL4:ȰT|4~*!oXQR6Lk+#t/g lԁߖ[Jڶ_N$k*". xsxX7jRVbAAʯKҎU3)zSNN _'s?f)6X!%ssAkʱ>qƷb hg %n ~p1REGMHH=BJiy[<5 ǁJҖgKR*倳e~HUy)Ag,K)`Vw6bRR:qL#\rclK/$sh*$ 6덤 KԖc 3Z9=Ɣ=o>X Ώ"1 )a`SJJ6k(<c e{%kϊP+SL'TcMJWRm ŏ"w)qc ef꒵i?b7b('"2r%~HUS1\<(`1Wx9=8HY9m:X18bgD1u ~|H;K-Uep,, C1 RV.MR5άh,tWO8WC$ XRVsQS]3GJ|12 [vM :k#~tH30Rf-HYݺ-`I9%lIDTm\ S{]9gOڒMNCV\G*2JRŨ;Rҏ^ڽ̱mq1Eu?To3I)y^#jJw^Ńj^vvlB_⋌P4x>0$c>K†Aļ9s_VjTt0l#m>E-,,x,-W)سo&96RE XR.6bXw+)GAEvL)͞K4$p=Ũi_ѱOjb HY/+@θH9޼]Nԥ%n{ &zjT? Ty) s^ULlb,PiTf^<À] 62R^V7)S!nllS6~͝V}-=%* ʻ>G DnK<y&>LPy7'r=Hj 9V`[c"*^8HpcO8bnU`4JȪAƋ#1_\ XϘHPRgik(~G~0DAA_2p|J묭a2\NCr]M_0 ^T%e#vD^%xy-n}-E\3aS%yN!r_{ )sAw ڼp1pEAk~v<:`'ӭ^5 ArXOI驻T (dk)_\ PuA*BY]yB"l\ey hH*tbK)3 IKZ򹞋XjN n *n>k]X_d!ryBH ]*R 0(#'7 %es9??ښFC,ՁQPjARJ\Ρw K#jahgw;2$l*) %Xq5!U᢯6Re] |0[__64ch&_}iL8KEgҎ7 M/\`|.p,~`a=BR?xܐrQ8K XR2M8f ?`sgWS%" Ԉ 7R%$ N}?QL1|-эټwIZ%pvL3Hk>,ImgW7{E xPHx73RA @RS CC !\ȟ5IXR^ZxHл$Q[ŝ40 (>+ _C >BRt<,TrT {O/H+˟Pl6 I B)/VC<6a2~(XwV4gnXR ϱ5ǀHٻ?tw똤Eyxp{#WK qG%5],(0ӈH HZ])ג=K1j&G(FbM@)%I` XRg ʔ KZG(vP,<`[ Kn^ SJRsAʠ5xՅF`0&RbV tx:EaUE/{fi2;.IAwW8/tTxAGOoN?G}l L(n`Zv?pB8K_gI+ܗ #i?ޙ.) p$utc ~DžfՈEo3l/)I-U?aԅ^jxArA ΧX}DmZ@QLےbTXGd.^|xKHR{|ΕW_h] IJ`[G9{).y) 0X YA1]qp?p_k+J*Y@HI>^?gt.06Rn ,` ?);p pSF9ZXLBJPWjgQ|&)7! HjQt<| ؅W5 x W HIzYoVMGP Hjn`+\(dNW)F+IrS[|/a`K|ͻ0Hj{R,Q=\ (F}\WR)AgSG`IsnAR=|8$}G(vC$)s FBJ?]_u XRvύ6z ŨG[36-T9HzpW̞ú Xg큽=7CufzI$)ki^qk-) 0H*N` QZkk]/tnnsI^Gu't=7$ Z;{8^jB% IItRQS7[ϭ3 $_OQJ`7!]W"W,)Iy W AJA;KWG`IY{8k$I$^%9.^(`N|LJ%@$I}ֽp=FB*xN=gI?Q{٥4B)mw $Igc~dZ@G9K X?7)aK%݅K$IZ-`IpC U6$I\0>!9k} Xa IIS0H$I H ?1R.Чj:4~Rw@p$IrA*u}WjWFPJ$I➓/6#! LӾ+ X36x8J |+L;v$Io4301R20M I$-E}@,pS^ޟR[/s¹'0H$IKyfŸfVOπFT*a$I>He~VY/3R/)>d$I>28`Cjw,n@FU*9ttf$I~<;=/4RD~@ X-ѕzἱI$: ԍR a@b X{+Qxuq$IЛzo /~3\8ڒ4BN7$IҀj V]n18H$IYFBj3̵̚ja pp $Is/3R Ӻ-Yj+L;.0ŔI$Av? #!5"aʄj}UKmɽH$IjCYs?h$IDl843.v}m7UiI=&=0Lg0$I4: embe` eQbm0u? $IT!Sƍ'-sv)s#C0:XB2a w I$zbww{."pPzO =Ɔ\[ o($Iaw]`E).Kvi:L*#gР7[$IyGPI=@R 4yR~̮´cg I$I/<tPͽ hDgo 94Z^k盇΄8I56^W$I^0̜N?4*H`237}g+hxoq)SJ@p|` $I%>-hO0eO>\ԣNߌZD6R=K ~n($I$y3D>o4b#px2$yڪtzW~a $I~?x'BwwpH$IZݑnC㧄Pc_9sO gwJ=l1:mKB>Ab<4Lp$Ib o1ZQ@85b̍ S'F,Fe,^I$IjEdù{l4 8Ys_s Z8.x m"+{~?q,Z D!I$ϻ'|XhB)=…']M>5 rgotԎ 獽PH$IjIPhh)n#cÔqA'ug5qwU&rF|1E%I$%]!'3AFD/;Ck_`9 v!ٴtPV;x`'*bQa w I$Ix5 FC3D_~A_#O݆DvV?<qw+I$I{=Z8".#RIYyjǪ=fDl9%M,a8$I$Ywi[7ݍFe$s1ՋBVA?`]#!oz4zjLJo8$I$%@3jAa4(o ;p,,dya=F9ً[LSPH$IJYЉ+3> 5"39aZ<ñh!{TpBGkj}Sp $IlvF.F$I z< '\K*qq.f<2Y!S"-\I$IYwčjF$ w9 \ߪB.1v!Ʊ?+r:^!I$BϹB H"B;L'G[ 4U#5>੐)|#o0aڱ$I>}k&1`U#V?YsV x>{t1[I~D&(I$I/{H0fw"q"y%4 IXyE~M3 8XψL}qE$I[> nD?~sf ]o΁ cT6"?'_Ἣ $I>~.f|'!N?⟩0G KkXZE]ޡ;/&?k OۘH$IRۀwXӨ<7@PnS04aӶp.:@\IWQJ6sS%I$e5ڑv`3:x';wq_vpgHyXZ 3gЂ7{{EuԹn±}$I$8t;b|591nءQ"P6O5i }iR̈́%Q̄p!I䮢]O{H$IRϻ9s֧ a=`- aB\X0"+5"C1Hb?߮3x3&gşggl_hZ^,`5?ߎvĸ%̀M!OZC2#0x LJ0 Gw$I$I}<{Eb+y;iI,`ܚF:5ܛA8-O-|8K7s|#Z8a&><a&/VtbtLʌI$I$I$I$I$I$IRjDD%tEXtdate:create2022-05-31T04:40:26+00:00!Î%tEXtdate:modify2022-05-31T04:40:26+00:00|{2IENDB`Mini Shell

HOME


Mini Shell 1.0
DIR:/usr/share/doc/python-docs-2.7.5/html/library/
Upload File :
Current File : //usr/share/doc/python-docs-2.7.5/html/library/json.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">


<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    
    <title>18.2. json — JSON encoder and decoder &mdash; Python 2.7.5 documentation</title>
    
    <link rel="stylesheet" href="../_static/default.css" type="text/css" />
    <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
    
    <script type="text/javascript">
      var DOCUMENTATION_OPTIONS = {
        URL_ROOT:    '../',
        VERSION:     '2.7.5',
        COLLAPSE_INDEX: false,
        FILE_SUFFIX: '.html',
        HAS_SOURCE:  true
      };
    </script>
    <script type="text/javascript" src="../_static/jquery.js"></script>
    <script type="text/javascript" src="../_static/underscore.js"></script>
    <script type="text/javascript" src="../_static/doctools.js"></script>
    <script type="text/javascript" src="../_static/sidebar.js"></script>
    <link rel="search" type="application/opensearchdescription+xml"
          title="Search within Python 2.7.5 documentation"
          href="../_static/opensearch.xml"/>
    <link rel="author" title="About these documents" href="../about.html" />
    <link rel="copyright" title="Copyright" href="../copyright.html" />
    <link rel="top" title="Python 2.7.5 documentation" href="../index.html" />
    <link rel="up" title="18. Internet Data Handling" href="netdata.html" />
    <link rel="next" title="18.3. mailcap — Mailcap file handling" href="mailcap.html" />
    <link rel="prev" title="18.1.11. email: Examples" href="email-examples.html" />
    <link rel="shortcut icon" type="image/png" href="../_static/py.png" />
    <script type="text/javascript" src="../_static/copybutton.js"></script>
    
 

  </head>
  <body>
    <div class="related">
      <h3>Navigation</h3>
      <ul>
        <li class="right" style="margin-right: 10px">
          <a href="../genindex.html" title="General Index"
             accesskey="I">index</a></li>
        <li class="right" >
          <a href="../py-modindex.html" title="Python Module Index"
             >modules</a> |</li>
        <li class="right" >
          <a href="mailcap.html" title="18.3. mailcap — Mailcap file handling"
             accesskey="N">next</a> |</li>
        <li class="right" >
          <a href="email-examples.html" title="18.1.11. email: Examples"
             accesskey="P">previous</a> |</li>
        <li><img src="../_static/py.png" alt=""
                 style="vertical-align: middle; margin-top: -1px"/></li>
        <li><a href="http://www.python.org/">Python</a> &raquo;</li>
        <li>
          <a href="../index.html">Python 2.7.5 documentation</a> &raquo;
        </li>

          <li><a href="index.html" >The Python Standard Library</a> &raquo;</li>
          <li><a href="netdata.html" accesskey="U">18. Internet Data Handling</a> &raquo;</li> 
      </ul>
    </div>  

    <div class="document">
      <div class="documentwrapper">
        <div class="bodywrapper">
          <div class="body">
            
  <div class="section" id="module-json">
<span id="json-json-encoder-and-decoder"></span><h1>18.2. <a class="reference internal" href="#module-json" title="json: Encode and decode the JSON format."><tt class="xref py py-mod docutils literal"><span class="pre">json</span></tt></a> &#8212; JSON encoder and decoder<a class="headerlink" href="#module-json" title="Permalink to this headline">¶</a></h1>
<p class="versionadded">
<span class="versionmodified">New in version 2.6.</span></p>
<p><a class="reference external" href="http://json.org">JSON (JavaScript Object Notation)</a>, specified by
<span class="target" id="index-0"></span><a class="rfc reference external" href="http://tools.ietf.org/html/rfc4627.html"><strong>RFC 4627</strong></a>, is a lightweight data interchange format based on a subset of
<a class="reference external" href="http://en.wikipedia.org/wiki/JavaScript">JavaScript</a> syntax (<a class="reference external" href="http://www.ecma-international.org/publications/files/ECMA-ST-ARCH/ECMA-262,%203rd%20edition,%20December%201999.pdf">ECMA-262 3rd
edition</a>).</p>
<p><a class="reference internal" href="#module-json" title="json: Encode and decode the JSON format."><tt class="xref py py-mod docutils literal"><span class="pre">json</span></tt></a> exposes an API familiar to users of the standard library
<a class="reference internal" href="marshal.html#module-marshal" title="marshal: Convert Python objects to streams of bytes and back (with different constraints)."><tt class="xref py py-mod docutils literal"><span class="pre">marshal</span></tt></a> and <a class="reference internal" href="pickle.html#module-pickle" title="pickle: Convert Python objects to streams of bytes and back."><tt class="xref py py-mod docutils literal"><span class="pre">pickle</span></tt></a> modules.</p>
<p>Encoding basic Python object hierarchies:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">json</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">([</span><span class="s">&#39;foo&#39;</span><span class="p">,</span> <span class="p">{</span><span class="s">&#39;bar&#39;</span><span class="p">:</span> <span class="p">(</span><span class="s">&#39;baz&#39;</span><span class="p">,</span> <span class="bp">None</span><span class="p">,</span> <span class="mf">1.0</span><span class="p">,</span> <span class="mi">2</span><span class="p">)}])</span>
<span class="go">&#39;[&quot;foo&quot;, {&quot;bar&quot;: [&quot;baz&quot;, null, 1.0, 2]}]&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">print</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="s">&quot;</span><span class="se">\&quot;</span><span class="s">foo</span><span class="se">\b</span><span class="s">ar&quot;</span><span class="p">)</span>
<span class="go">&quot;\&quot;foo\bar&quot;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">print</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="s">u&#39;</span><span class="se">\u1234</span><span class="s">&#39;</span><span class="p">)</span>
<span class="go">&quot;\u1234&quot;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">print</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="s">&#39;</span><span class="se">\\</span><span class="s">&#39;</span><span class="p">)</span>
<span class="go">&quot;\\&quot;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">print</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">({</span><span class="s">&quot;c&quot;</span><span class="p">:</span> <span class="mi">0</span><span class="p">,</span> <span class="s">&quot;b&quot;</span><span class="p">:</span> <span class="mi">0</span><span class="p">,</span> <span class="s">&quot;a&quot;</span><span class="p">:</span> <span class="mi">0</span><span class="p">},</span> <span class="n">sort_keys</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="go">{&quot;a&quot;: 0, &quot;b&quot;: 0, &quot;c&quot;: 0}</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">StringIO</span> <span class="kn">import</span> <span class="n">StringIO</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">io</span> <span class="o">=</span> <span class="n">StringIO</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o">.</span><span class="n">dump</span><span class="p">([</span><span class="s">&#39;streaming API&#39;</span><span class="p">],</span> <span class="n">io</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">io</span><span class="o">.</span><span class="n">getvalue</span><span class="p">()</span>
<span class="go">&#39;[&quot;streaming API&quot;]&#39;</span>
</pre></div>
</div>
<p>Compact encoding:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">json</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">([</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">,{</span><span class="s">&#39;4&#39;</span><span class="p">:</span> <span class="mi">5</span><span class="p">,</span> <span class="s">&#39;6&#39;</span><span class="p">:</span> <span class="mi">7</span><span class="p">}],</span> <span class="n">separators</span><span class="o">=</span><span class="p">(</span><span class="s">&#39;,&#39;</span><span class="p">,</span><span class="s">&#39;:&#39;</span><span class="p">))</span>
<span class="go">&#39;[1,2,3,{&quot;4&quot;:5,&quot;6&quot;:7}]&#39;</span>
</pre></div>
</div>
<p>Pretty printing:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">json</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">print</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">({</span><span class="s">&#39;4&#39;</span><span class="p">:</span> <span class="mi">5</span><span class="p">,</span> <span class="s">&#39;6&#39;</span><span class="p">:</span> <span class="mi">7</span><span class="p">},</span> <span class="n">sort_keys</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span>
<span class="gp">... </span>                 <span class="n">indent</span><span class="o">=</span><span class="mi">4</span><span class="p">,</span> <span class="n">separators</span><span class="o">=</span><span class="p">(</span><span class="s">&#39;,&#39;</span><span class="p">,</span> <span class="s">&#39;: &#39;</span><span class="p">))</span>
<span class="go">{</span>
<span class="go">    &quot;4&quot;: 5,</span>
<span class="go">    &quot;6&quot;: 7</span>
<span class="go">}</span>
</pre></div>
</div>
<p>Decoding JSON:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">json</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="s">&#39;[&quot;foo&quot;, {&quot;bar&quot;:[&quot;baz&quot;, null, 1.0, 2]}]&#39;</span><span class="p">)</span>
<span class="go">[u&#39;foo&#39;, {u&#39;bar&#39;: [u&#39;baz&#39;, None, 1.0, 2]}]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="s">&#39;&quot;</span><span class="se">\\</span><span class="s">&quot;foo</span><span class="se">\\</span><span class="s">bar&quot;&#39;</span><span class="p">)</span>
<span class="go">u&#39;&quot;foo\x08ar&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">StringIO</span> <span class="kn">import</span> <span class="n">StringIO</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">io</span> <span class="o">=</span> <span class="n">StringIO</span><span class="p">(</span><span class="s">&#39;[&quot;streaming API&quot;]&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">io</span><span class="p">)</span>
<span class="go">[u&#39;streaming API&#39;]</span>
</pre></div>
</div>
<p>Specializing JSON object decoding:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">json</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">as_complex</span><span class="p">(</span><span class="n">dct</span><span class="p">):</span>
<span class="gp">... </span>    <span class="k">if</span> <span class="s">&#39;__complex__&#39;</span> <span class="ow">in</span> <span class="n">dct</span><span class="p">:</span>
<span class="gp">... </span>        <span class="k">return</span> <span class="nb">complex</span><span class="p">(</span><span class="n">dct</span><span class="p">[</span><span class="s">&#39;real&#39;</span><span class="p">],</span> <span class="n">dct</span><span class="p">[</span><span class="s">&#39;imag&#39;</span><span class="p">])</span>
<span class="gp">... </span>    <span class="k">return</span> <span class="n">dct</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="s">&#39;{&quot;__complex__&quot;: true, &quot;real&quot;: 1, &quot;imag&quot;: 2}&#39;</span><span class="p">,</span>
<span class="gp">... </span>    <span class="n">object_hook</span><span class="o">=</span><span class="n">as_complex</span><span class="p">)</span>
<span class="go">(1+2j)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">decimal</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="s">&#39;1.1&#39;</span><span class="p">,</span> <span class="n">parse_float</span><span class="o">=</span><span class="n">decimal</span><span class="o">.</span><span class="n">Decimal</span><span class="p">)</span>
<span class="go">Decimal(&#39;1.1&#39;)</span>
</pre></div>
</div>
<p>Extending <a class="reference internal" href="#json.JSONEncoder" title="json.JSONEncoder"><tt class="xref py py-class docutils literal"><span class="pre">JSONEncoder</span></tt></a>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">json</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">ComplexEncoder</span><span class="p">(</span><span class="n">json</span><span class="o">.</span><span class="n">JSONEncoder</span><span class="p">):</span>
<span class="gp">... </span>    <span class="k">def</span> <span class="nf">default</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">obj</span><span class="p">):</span>
<span class="gp">... </span>        <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">obj</span><span class="p">,</span> <span class="nb">complex</span><span class="p">):</span>
<span class="gp">... </span>            <span class="k">return</span> <span class="p">[</span><span class="n">obj</span><span class="o">.</span><span class="n">real</span><span class="p">,</span> <span class="n">obj</span><span class="o">.</span><span class="n">imag</span><span class="p">]</span>
<span class="gp">... </span>        <span class="c"># Let the base class default method raise the TypeError</span>
<span class="gp">... </span>        <span class="k">return</span> <span class="n">json</span><span class="o">.</span><span class="n">JSONEncoder</span><span class="o">.</span><span class="n">default</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">obj</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">dumps</span><span class="p">(</span><span class="mi">2</span> <span class="o">+</span> <span class="mi">1</span><span class="n">j</span><span class="p">,</span> <span class="n">cls</span><span class="o">=</span><span class="n">ComplexEncoder</span><span class="p">)</span>
<span class="go">&#39;[2.0, 1.0]&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">ComplexEncoder</span><span class="p">()</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="mi">2</span> <span class="o">+</span> <span class="mi">1</span><span class="n">j</span><span class="p">)</span>
<span class="go">&#39;[2.0, 1.0]&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">list</span><span class="p">(</span><span class="n">ComplexEncoder</span><span class="p">()</span><span class="o">.</span><span class="n">iterencode</span><span class="p">(</span><span class="mi">2</span> <span class="o">+</span> <span class="mi">1</span><span class="n">j</span><span class="p">))</span>
<span class="go">[&#39;[&#39;, &#39;2.0&#39;, &#39;, &#39;, &#39;1.0&#39;, &#39;]&#39;]</span>
</pre></div>
</div>
<p>Using json.tool from the shell to validate and pretty-print:</p>
<div class="highlight-none"><div class="highlight"><pre>$ echo &#39;{&quot;json&quot;:&quot;obj&quot;}&#39; | python -mjson.tool
{
    &quot;json&quot;: &quot;obj&quot;
}
$ echo &#39;{1.2:3.4}&#39; | python -mjson.tool
Expecting property name enclosed in double quotes: line 1 column 2 (char 1)
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">JSON is a subset of <a class="reference external" href="http://yaml.org/">YAML</a> 1.2.  The JSON produced by
this module&#8217;s default settings (in particular, the default <em>separators</em>
value) is also a subset of YAML 1.0 and 1.1.  This module can thus also be
used as a YAML serializer.</p>
</div>
<div class="section" id="basic-usage">
<h2>18.2.1. Basic Usage<a class="headerlink" href="#basic-usage" title="Permalink to this headline">¶</a></h2>
<dl class="function">
<dt id="json.dump">
<tt class="descclassname">json.</tt><tt class="descname">dump</tt><big>(</big><em>obj</em>, <em>fp</em>, <em>skipkeys=False</em>, <em>ensure_ascii=True</em>, <em>check_circular=True</em>, <em>allow_nan=True</em>, <em>cls=None</em>, <em>indent=None</em>, <em>separators=None</em>, <em>encoding=&quot;utf-8&quot;</em>, <em>default=None</em>, <em>sort_keys=False</em>, <em>**kw</em><big>)</big><a class="headerlink" href="#json.dump" title="Permalink to this definition">¶</a></dt>
<dd><p>Serialize <em>obj</em> as a JSON formatted stream to <em>fp</em> (a <tt class="docutils literal"><span class="pre">.write()</span></tt>-supporting
<a class="reference internal" href="../glossary.html#term-file-like-object"><em class="xref std std-term">file-like object</em></a>) using this <a class="reference internal" href="#py-to-json-table"><em>conversion table</em></a>.</p>
<p>If <em>skipkeys</em> is <tt class="docutils literal"><span class="pre">True</span></tt> (default: <tt class="docutils literal"><span class="pre">False</span></tt>), then dict keys that are not
of a basic type (<a class="reference internal" href="functions.html#str" title="str"><tt class="xref py py-class docutils literal"><span class="pre">str</span></tt></a>, <a class="reference internal" href="functions.html#unicode" title="unicode"><tt class="xref py py-class docutils literal"><span class="pre">unicode</span></tt></a>, <a class="reference internal" href="functions.html#int" title="int"><tt class="xref py py-class docutils literal"><span class="pre">int</span></tt></a>, <a class="reference internal" href="functions.html#long" title="long"><tt class="xref py py-class docutils literal"><span class="pre">long</span></tt></a>,
<a class="reference internal" href="functions.html#float" title="float"><tt class="xref py py-class docutils literal"><span class="pre">float</span></tt></a>, <a class="reference internal" href="functions.html#bool" title="bool"><tt class="xref py py-class docutils literal"><span class="pre">bool</span></tt></a>, <tt class="docutils literal"><span class="pre">None</span></tt>) will be skipped instead of raising a
<a class="reference internal" href="exceptions.html#exceptions.TypeError" title="exceptions.TypeError"><tt class="xref py py-exc docutils literal"><span class="pre">TypeError</span></tt></a>.</p>
<p>If <em>ensure_ascii</em> is <tt class="docutils literal"><span class="pre">True</span></tt> (the default), all non-ASCII characters in the
output are escaped with <tt class="docutils literal"><span class="pre">\uXXXX</span></tt> sequences, and the result is a
<a class="reference internal" href="functions.html#str" title="str"><tt class="xref py py-class docutils literal"><span class="pre">str</span></tt></a> instance consisting of ASCII characters only.  If
<em>ensure_ascii</em> is <tt class="docutils literal"><span class="pre">False</span></tt>, some chunks written to <em>fp</em> may be
<a class="reference internal" href="functions.html#unicode" title="unicode"><tt class="xref py py-class docutils literal"><span class="pre">unicode</span></tt></a> instances.  This usually happens because the input contains
unicode strings or the <em>encoding</em> parameter is used.  Unless <tt class="docutils literal"><span class="pre">fp.write()</span></tt>
explicitly understands <a class="reference internal" href="functions.html#unicode" title="unicode"><tt class="xref py py-class docutils literal"><span class="pre">unicode</span></tt></a> (as in <a class="reference internal" href="codecs.html#codecs.getwriter" title="codecs.getwriter"><tt class="xref py py-func docutils literal"><span class="pre">codecs.getwriter()</span></tt></a>)
this is likely to cause an error.</p>
<p>If <em>check_circular</em> is <tt class="docutils literal"><span class="pre">False</span></tt> (default: <tt class="docutils literal"><span class="pre">True</span></tt>), then the circular
reference check for container types will be skipped and a circular reference
will result in an <a class="reference internal" href="exceptions.html#exceptions.OverflowError" title="exceptions.OverflowError"><tt class="xref py py-exc docutils literal"><span class="pre">OverflowError</span></tt></a> (or worse).</p>
<p>If <em>allow_nan</em> is <tt class="docutils literal"><span class="pre">False</span></tt> (default: <tt class="docutils literal"><span class="pre">True</span></tt>), then it will be a
<a class="reference internal" href="exceptions.html#exceptions.ValueError" title="exceptions.ValueError"><tt class="xref py py-exc docutils literal"><span class="pre">ValueError</span></tt></a> to serialize out of range <a class="reference internal" href="functions.html#float" title="float"><tt class="xref py py-class docutils literal"><span class="pre">float</span></tt></a> values (<tt class="docutils literal"><span class="pre">nan</span></tt>,
<tt class="docutils literal"><span class="pre">inf</span></tt>, <tt class="docutils literal"><span class="pre">-inf</span></tt>) in strict compliance of the JSON specification, instead of
using the JavaScript equivalents (<tt class="docutils literal"><span class="pre">NaN</span></tt>, <tt class="docutils literal"><span class="pre">Infinity</span></tt>, <tt class="docutils literal"><span class="pre">-Infinity</span></tt>).</p>
<p>If <em>indent</em> is a non-negative integer, then JSON array elements and object
members will be pretty-printed with that indent level.  An indent level of 0,
or negative, will only insert newlines.  <tt class="docutils literal"><span class="pre">None</span></tt> (the default) selects the
most compact representation.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Since the default item separator is <tt class="docutils literal"><span class="pre">',</span> <span class="pre">'</span></tt>,  the output might include
trailing whitespace when <em>indent</em> is specified.  You can use
<tt class="docutils literal"><span class="pre">separators=(',',</span> <span class="pre">':</span> <span class="pre">')</span></tt> to avoid this.</p>
</div>
<p>If <em>separators</em> is an <tt class="docutils literal"><span class="pre">(item_separator,</span> <span class="pre">dict_separator)</span></tt> tuple, then it
will be used instead of the default <tt class="docutils literal"><span class="pre">(',</span> <span class="pre">',</span> <span class="pre">':</span> <span class="pre">')</span></tt> separators.  <tt class="docutils literal"><span class="pre">(',',</span>
<span class="pre">':')</span></tt> is the most compact JSON representation.</p>
<p><em>encoding</em> is the character encoding for str instances, default is UTF-8.</p>
<p><em>default(obj)</em> is a function that should return a serializable version of
<em>obj</em> or raise <a class="reference internal" href="exceptions.html#exceptions.TypeError" title="exceptions.TypeError"><tt class="xref py py-exc docutils literal"><span class="pre">TypeError</span></tt></a>.  The default simply raises <a class="reference internal" href="exceptions.html#exceptions.TypeError" title="exceptions.TypeError"><tt class="xref py py-exc docutils literal"><span class="pre">TypeError</span></tt></a>.</p>
<p>If <em>sort_keys</em> is <tt class="docutils literal"><span class="pre">True</span></tt> (default: <tt class="docutils literal"><span class="pre">False</span></tt>), then the output of
dictionaries will be sorted by key.</p>
<p>To use a custom <a class="reference internal" href="#json.JSONEncoder" title="json.JSONEncoder"><tt class="xref py py-class docutils literal"><span class="pre">JSONEncoder</span></tt></a> subclass (e.g. one that overrides the
<tt class="xref py py-meth docutils literal"><span class="pre">default()</span></tt> method to serialize additional types), specify it with the
<em>cls</em> kwarg; otherwise <a class="reference internal" href="#json.JSONEncoder" title="json.JSONEncoder"><tt class="xref py py-class docutils literal"><span class="pre">JSONEncoder</span></tt></a> is used.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Unlike <a class="reference internal" href="pickle.html#module-pickle" title="pickle: Convert Python objects to streams of bytes and back."><tt class="xref py py-mod docutils literal"><span class="pre">pickle</span></tt></a> and <a class="reference internal" href="marshal.html#module-marshal" title="marshal: Convert Python objects to streams of bytes and back (with different constraints)."><tt class="xref py py-mod docutils literal"><span class="pre">marshal</span></tt></a>, JSON is not a framed protocol so
trying to serialize more objects with repeated calls to <a class="reference internal" href="#json.dump" title="json.dump"><tt class="xref py py-func docutils literal"><span class="pre">dump()</span></tt></a> and
the same <em>fp</em> will result in an invalid JSON file.</p>
</div>
</dd></dl>

<dl class="function">
<dt id="json.dumps">
<tt class="descclassname">json.</tt><tt class="descname">dumps</tt><big>(</big><em>obj</em>, <em>skipkeys=False</em>, <em>ensure_ascii=True</em>, <em>check_circular=True</em>, <em>allow_nan=True</em>, <em>cls=None</em>, <em>indent=None</em>, <em>separators=None</em>, <em>encoding=&quot;utf-8&quot;</em>, <em>default=None</em>, <em>sort_keys=False</em>, <em>**kw</em><big>)</big><a class="headerlink" href="#json.dumps" title="Permalink to this definition">¶</a></dt>
<dd><p>Serialize <em>obj</em> to a JSON formatted <a class="reference internal" href="functions.html#str" title="str"><tt class="xref py py-class docutils literal"><span class="pre">str</span></tt></a> using this <a class="reference internal" href="#py-to-json-table"><em>conversion
table</em></a>.  If <em>ensure_ascii</em> is <tt class="docutils literal"><span class="pre">False</span></tt>, the result may
contain non-ASCII characters and the return value may be a <a class="reference internal" href="functions.html#unicode" title="unicode"><tt class="xref py py-class docutils literal"><span class="pre">unicode</span></tt></a>
instance.</p>
<p>The arguments have the same meaning as in <a class="reference internal" href="#json.dump" title="json.dump"><tt class="xref py py-func docutils literal"><span class="pre">dump()</span></tt></a>.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Keys in key/value pairs of JSON are always of the type <a class="reference internal" href="functions.html#str" title="str"><tt class="xref py py-class docutils literal"><span class="pre">str</span></tt></a>. When
a dictionary is converted into JSON, all the keys of the dictionary are
coerced to strings. As a result of this, if a dictionary is converted
into JSON and then back into a dictionary, the dictionary may not equal
the original one. That is, <tt class="docutils literal"><span class="pre">loads(dumps(x))</span> <span class="pre">!=</span> <span class="pre">x</span></tt> if x has non-string
keys.</p>
</div>
</dd></dl>

<dl class="function">
<dt id="json.load">
<tt class="descclassname">json.</tt><tt class="descname">load</tt><big>(</big><em>fp</em><span class="optional">[</span>, <em>encoding</em><span class="optional">[</span>, <em>cls</em><span class="optional">[</span>, <em>object_hook</em><span class="optional">[</span>, <em>parse_float</em><span class="optional">[</span>, <em>parse_int</em><span class="optional">[</span>, <em>parse_constant</em><span class="optional">[</span>, <em>object_pairs_hook</em><span class="optional">[</span>, <em>**kw</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#json.load" title="Permalink to this definition">¶</a></dt>
<dd><p>Deserialize <em>fp</em> (a <tt class="docutils literal"><span class="pre">.read()</span></tt>-supporting <a class="reference internal" href="../glossary.html#term-file-like-object"><em class="xref std std-term">file-like object</em></a>
containing a JSON document) to a Python object using this <a class="reference internal" href="#json-to-py-table"><em>conversion
table</em></a>.</p>
<p>If the contents of <em>fp</em> are encoded with an ASCII based encoding other than
UTF-8 (e.g. latin-1), then an appropriate <em>encoding</em> name must be specified.
Encodings that are not ASCII based (such as UCS-2) are not allowed, and
should be wrapped with <tt class="docutils literal"><span class="pre">codecs.getreader(encoding)(fp)</span></tt>, or simply decoded
to a <a class="reference internal" href="functions.html#unicode" title="unicode"><tt class="xref py py-class docutils literal"><span class="pre">unicode</span></tt></a> object and passed to <a class="reference internal" href="#json.loads" title="json.loads"><tt class="xref py py-func docutils literal"><span class="pre">loads()</span></tt></a>.</p>
<p><em>object_hook</em> is an optional function that will be called with the result of
any object literal decoded (a <a class="reference internal" href="stdtypes.html#dict" title="dict"><tt class="xref py py-class docutils literal"><span class="pre">dict</span></tt></a>).  The return value of
<em>object_hook</em> will be used instead of the <a class="reference internal" href="stdtypes.html#dict" title="dict"><tt class="xref py py-class docutils literal"><span class="pre">dict</span></tt></a>.  This feature can be used
to implement custom decoders (e.g. <a class="reference external" href="http://www.jsonrpc.org">JSON-RPC</a>
class hinting).</p>
<p><em>object_pairs_hook</em> is an optional function that will be called with the
result of any object literal decoded with an ordered list of pairs.  The
return value of <em>object_pairs_hook</em> will be used instead of the
<a class="reference internal" href="stdtypes.html#dict" title="dict"><tt class="xref py py-class docutils literal"><span class="pre">dict</span></tt></a>.  This feature can be used to implement custom decoders that
rely on the order that the key and value pairs are decoded (for example,
<a class="reference internal" href="collections.html#collections.OrderedDict" title="collections.OrderedDict"><tt class="xref py py-func docutils literal"><span class="pre">collections.OrderedDict()</span></tt></a> will remember the order of insertion). If
<em>object_hook</em> is also defined, the <em>object_pairs_hook</em> takes priority.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.7: </span>Added support for <em>object_pairs_hook</em>.</p>
<p><em>parse_float</em>, if specified, will be called with the string of every JSON
float to be decoded.  By default, this is equivalent to <tt class="docutils literal"><span class="pre">float(num_str)</span></tt>.
This can be used to use another datatype or parser for JSON floats
(e.g. <a class="reference internal" href="decimal.html#decimal.Decimal" title="decimal.Decimal"><tt class="xref py py-class docutils literal"><span class="pre">decimal.Decimal</span></tt></a>).</p>
<p><em>parse_int</em>, if specified, will be called with the string of every JSON int
to be decoded.  By default, this is equivalent to <tt class="docutils literal"><span class="pre">int(num_str)</span></tt>.  This can
be used to use another datatype or parser for JSON integers
(e.g. <a class="reference internal" href="functions.html#float" title="float"><tt class="xref py py-class docutils literal"><span class="pre">float</span></tt></a>).</p>
<p><em>parse_constant</em>, if specified, will be called with one of the following
strings: <tt class="docutils literal"><span class="pre">'-Infinity'</span></tt>, <tt class="docutils literal"><span class="pre">'Infinity'</span></tt>, <tt class="docutils literal"><span class="pre">'NaN'</span></tt>.
This can be used to raise an exception if invalid JSON numbers
are encountered.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.7: </span><em>parse_constant</em> doesn&#8217;t get called on &#8216;null&#8217;, &#8216;true&#8217;, &#8216;false&#8217; anymore.</p>
<p>To use a custom <a class="reference internal" href="#json.JSONDecoder" title="json.JSONDecoder"><tt class="xref py py-class docutils literal"><span class="pre">JSONDecoder</span></tt></a> subclass, specify it with the <tt class="docutils literal"><span class="pre">cls</span></tt>
kwarg; otherwise <a class="reference internal" href="#json.JSONDecoder" title="json.JSONDecoder"><tt class="xref py py-class docutils literal"><span class="pre">JSONDecoder</span></tt></a> is used.  Additional keyword arguments
will be passed to the constructor of the class.</p>
</dd></dl>

<dl class="function">
<dt id="json.loads">
<tt class="descclassname">json.</tt><tt class="descname">loads</tt><big>(</big><em>s</em><span class="optional">[</span>, <em>encoding</em><span class="optional">[</span>, <em>cls</em><span class="optional">[</span>, <em>object_hook</em><span class="optional">[</span>, <em>parse_float</em><span class="optional">[</span>, <em>parse_int</em><span class="optional">[</span>, <em>parse_constant</em><span class="optional">[</span>, <em>object_pairs_hook</em><span class="optional">[</span>, <em>**kw</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#json.loads" title="Permalink to this definition">¶</a></dt>
<dd><p>Deserialize <em>s</em> (a <a class="reference internal" href="functions.html#str" title="str"><tt class="xref py py-class docutils literal"><span class="pre">str</span></tt></a> or <a class="reference internal" href="functions.html#unicode" title="unicode"><tt class="xref py py-class docutils literal"><span class="pre">unicode</span></tt></a> instance containing a JSON
document) to a Python object using this <a class="reference internal" href="#json-to-py-table"><em>conversion table</em></a>.</p>
<p>If <em>s</em> is a <a class="reference internal" href="functions.html#str" title="str"><tt class="xref py py-class docutils literal"><span class="pre">str</span></tt></a> instance and is encoded with an ASCII based encoding
other than UTF-8 (e.g. latin-1), then an appropriate <em>encoding</em> name must be
specified.  Encodings that are not ASCII based (such as UCS-2) are not
allowed and should be decoded to <a class="reference internal" href="functions.html#unicode" title="unicode"><tt class="xref py py-class docutils literal"><span class="pre">unicode</span></tt></a> first.</p>
<p>The other arguments have the same meaning as in <a class="reference internal" href="#json.load" title="json.load"><tt class="xref py py-func docutils literal"><span class="pre">load()</span></tt></a>.</p>
</dd></dl>

</div>
<div class="section" id="encoders-and-decoders">
<h2>18.2.2. Encoders and Decoders<a class="headerlink" href="#encoders-and-decoders" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="json.JSONDecoder">
<em class="property">class </em><tt class="descclassname">json.</tt><tt class="descname">JSONDecoder</tt><big>(</big><span class="optional">[</span><em>encoding</em><span class="optional">[</span>, <em>object_hook</em><span class="optional">[</span>, <em>parse_float</em><span class="optional">[</span>, <em>parse_int</em><span class="optional">[</span>, <em>parse_constant</em><span class="optional">[</span>, <em>strict</em><span class="optional">[</span>, <em>object_pairs_hook</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#json.JSONDecoder" title="Permalink to this definition">¶</a></dt>
<dd><p>Simple JSON decoder.</p>
<p>Performs the following translations in decoding by default:</p>
<table border="1" class="docutils" id="json-to-py-table">
<colgroup>
<col width="44%" />
<col width="56%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">JSON</th>
<th class="head">Python</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>object</td>
<td>dict</td>
</tr>
<tr class="row-odd"><td>array</td>
<td>list</td>
</tr>
<tr class="row-even"><td>string</td>
<td>unicode</td>
</tr>
<tr class="row-odd"><td>number (int)</td>
<td>int, long</td>
</tr>
<tr class="row-even"><td>number (real)</td>
<td>float</td>
</tr>
<tr class="row-odd"><td>true</td>
<td>True</td>
</tr>
<tr class="row-even"><td>false</td>
<td>False</td>
</tr>
<tr class="row-odd"><td>null</td>
<td>None</td>
</tr>
</tbody>
</table>
<p>It also understands <tt class="docutils literal"><span class="pre">NaN</span></tt>, <tt class="docutils literal"><span class="pre">Infinity</span></tt>, and <tt class="docutils literal"><span class="pre">-Infinity</span></tt> as their
corresponding <tt class="docutils literal"><span class="pre">float</span></tt> values, which is outside the JSON spec.</p>
<p><em>encoding</em> determines the encoding used to interpret any <a class="reference internal" href="functions.html#str" title="str"><tt class="xref py py-class docutils literal"><span class="pre">str</span></tt></a> objects
decoded by this instance (UTF-8 by default).  It has no effect when decoding
<a class="reference internal" href="functions.html#unicode" title="unicode"><tt class="xref py py-class docutils literal"><span class="pre">unicode</span></tt></a> objects.</p>
<p>Note that currently only encodings that are a superset of ASCII work, strings
of other encodings should be passed in as <a class="reference internal" href="functions.html#unicode" title="unicode"><tt class="xref py py-class docutils literal"><span class="pre">unicode</span></tt></a>.</p>
<p><em>object_hook</em>, if specified, will be called with the result of every JSON
object decoded and its return value will be used in place of the given
<a class="reference internal" href="stdtypes.html#dict" title="dict"><tt class="xref py py-class docutils literal"><span class="pre">dict</span></tt></a>.  This can be used to provide custom deserializations (e.g. to
support JSON-RPC class hinting).</p>
<p><em>object_pairs_hook</em>, if specified will be called with the result of every
JSON object decoded with an ordered list of pairs.  The return value of
<em>object_pairs_hook</em> will be used instead of the <a class="reference internal" href="stdtypes.html#dict" title="dict"><tt class="xref py py-class docutils literal"><span class="pre">dict</span></tt></a>.  This
feature can be used to implement custom decoders that rely on the order
that the key and value pairs are decoded (for example,
<a class="reference internal" href="collections.html#collections.OrderedDict" title="collections.OrderedDict"><tt class="xref py py-func docutils literal"><span class="pre">collections.OrderedDict()</span></tt></a> will remember the order of insertion). If
<em>object_hook</em> is also defined, the <em>object_pairs_hook</em> takes priority.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.7: </span>Added support for <em>object_pairs_hook</em>.</p>
<p><em>parse_float</em>, if specified, will be called with the string of every JSON
float to be decoded.  By default, this is equivalent to <tt class="docutils literal"><span class="pre">float(num_str)</span></tt>.
This can be used to use another datatype or parser for JSON floats
(e.g. <a class="reference internal" href="decimal.html#decimal.Decimal" title="decimal.Decimal"><tt class="xref py py-class docutils literal"><span class="pre">decimal.Decimal</span></tt></a>).</p>
<p><em>parse_int</em>, if specified, will be called with the string of every JSON int
to be decoded.  By default, this is equivalent to <tt class="docutils literal"><span class="pre">int(num_str)</span></tt>.  This can
be used to use another datatype or parser for JSON integers
(e.g. <a class="reference internal" href="functions.html#float" title="float"><tt class="xref py py-class docutils literal"><span class="pre">float</span></tt></a>).</p>
<p><em>parse_constant</em>, if specified, will be called with one of the following
strings: <tt class="docutils literal"><span class="pre">'-Infinity'</span></tt>, <tt class="docutils literal"><span class="pre">'Infinity'</span></tt>, <tt class="docutils literal"><span class="pre">'NaN'</span></tt>, <tt class="docutils literal"><span class="pre">'null'</span></tt>, <tt class="docutils literal"><span class="pre">'true'</span></tt>,
<tt class="docutils literal"><span class="pre">'false'</span></tt>.  This can be used to raise an exception if invalid JSON numbers
are encountered.</p>
<p>If <em>strict</em> is <tt class="docutils literal"><span class="pre">False</span></tt> (<tt class="docutils literal"><span class="pre">True</span></tt> is the default), then control characters
will be allowed inside strings.  Control characters in this context are
those with character codes in the 0-31 range, including <tt class="docutils literal"><span class="pre">'\t'</span></tt> (tab),
<tt class="docutils literal"><span class="pre">'\n'</span></tt>, <tt class="docutils literal"><span class="pre">'\r'</span></tt> and <tt class="docutils literal"><span class="pre">'\0'</span></tt>.</p>
<dl class="method">
<dt id="json.JSONDecoder.decode">
<tt class="descname">decode</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#json.JSONDecoder.decode" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the Python representation of <em>s</em> (a <a class="reference internal" href="functions.html#str" title="str"><tt class="xref py py-class docutils literal"><span class="pre">str</span></tt></a> or
<a class="reference internal" href="functions.html#unicode" title="unicode"><tt class="xref py py-class docutils literal"><span class="pre">unicode</span></tt></a> instance containing a JSON document)</p>
</dd></dl>

<dl class="method">
<dt id="json.JSONDecoder.raw_decode">
<tt class="descname">raw_decode</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#json.JSONDecoder.raw_decode" title="Permalink to this definition">¶</a></dt>
<dd><p>Decode a JSON document from <em>s</em> (a <a class="reference internal" href="functions.html#str" title="str"><tt class="xref py py-class docutils literal"><span class="pre">str</span></tt></a> or <a class="reference internal" href="functions.html#unicode" title="unicode"><tt class="xref py py-class docutils literal"><span class="pre">unicode</span></tt></a>
beginning with a JSON document) and return a 2-tuple of the Python
representation and the index in <em>s</em> where the document ended.</p>
<p>This can be used to decode a JSON document from a string that may have
extraneous data at the end.</p>
</dd></dl>

</dd></dl>

<dl class="class">
<dt id="json.JSONEncoder">
<em class="property">class </em><tt class="descclassname">json.</tt><tt class="descname">JSONEncoder</tt><big>(</big><span class="optional">[</span><em>skipkeys</em><span class="optional">[</span>, <em>ensure_ascii</em><span class="optional">[</span>, <em>check_circular</em><span class="optional">[</span>, <em>allow_nan</em><span class="optional">[</span>, <em>sort_keys</em><span class="optional">[</span>, <em>indent</em><span class="optional">[</span>, <em>separators</em><span class="optional">[</span>, <em>encoding</em><span class="optional">[</span>, <em>default</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#json.JSONEncoder" title="Permalink to this definition">¶</a></dt>
<dd><p>Extensible JSON encoder for Python data structures.</p>
<p>Supports the following objects and types by default:</p>
<table border="1" class="docutils" id="py-to-json-table">
<colgroup>
<col width="56%" />
<col width="44%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Python</th>
<th class="head">JSON</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>dict</td>
<td>object</td>
</tr>
<tr class="row-odd"><td>list, tuple</td>
<td>array</td>
</tr>
<tr class="row-even"><td>str, unicode</td>
<td>string</td>
</tr>
<tr class="row-odd"><td>int, long, float</td>
<td>number</td>
</tr>
<tr class="row-even"><td>True</td>
<td>true</td>
</tr>
<tr class="row-odd"><td>False</td>
<td>false</td>
</tr>
<tr class="row-even"><td>None</td>
<td>null</td>
</tr>
</tbody>
</table>
<p>To extend this to recognize other objects, subclass and implement a
<a class="reference internal" href="#json.JSONEncoder.default" title="json.JSONEncoder.default"><tt class="xref py py-meth docutils literal"><span class="pre">default()</span></tt></a> method with another method that returns a serializable object
for <tt class="docutils literal"><span class="pre">o</span></tt> if possible, otherwise it should call the superclass implementation
(to raise <a class="reference internal" href="exceptions.html#exceptions.TypeError" title="exceptions.TypeError"><tt class="xref py py-exc docutils literal"><span class="pre">TypeError</span></tt></a>).</p>
<p>If <em>skipkeys</em> is <tt class="docutils literal"><span class="pre">False</span></tt> (the default), then it is a <a class="reference internal" href="exceptions.html#exceptions.TypeError" title="exceptions.TypeError"><tt class="xref py py-exc docutils literal"><span class="pre">TypeError</span></tt></a> to
attempt encoding of keys that are not str, int, long, float or None.  If
<em>skipkeys</em> is <tt class="docutils literal"><span class="pre">True</span></tt>, such items are simply skipped.</p>
<p>If <em>ensure_ascii</em> is <tt class="docutils literal"><span class="pre">True</span></tt> (the default), all non-ASCII characters in the
output are escaped with <tt class="docutils literal"><span class="pre">\uXXXX</span></tt> sequences, and the results are
<a class="reference internal" href="functions.html#str" title="str"><tt class="xref py py-class docutils literal"><span class="pre">str</span></tt></a> instances consisting of ASCII characters only. If
<em>ensure_ascii</em> is <tt class="docutils literal"><span class="pre">False</span></tt>, a result may be a <a class="reference internal" href="functions.html#unicode" title="unicode"><tt class="xref py py-class docutils literal"><span class="pre">unicode</span></tt></a>
instance. This usually happens if the input contains unicode strings or the
<em>encoding</em> parameter is used.</p>
<p>If <em>check_circular</em> is <tt class="docutils literal"><span class="pre">True</span></tt> (the default), then lists, dicts, and custom
encoded objects will be checked for circular references during encoding to
prevent an infinite recursion (which would cause an <a class="reference internal" href="exceptions.html#exceptions.OverflowError" title="exceptions.OverflowError"><tt class="xref py py-exc docutils literal"><span class="pre">OverflowError</span></tt></a>).
Otherwise, no such check takes place.</p>
<p>If <em>allow_nan</em> is <tt class="docutils literal"><span class="pre">True</span></tt> (the default), then <tt class="docutils literal"><span class="pre">NaN</span></tt>, <tt class="docutils literal"><span class="pre">Infinity</span></tt>, and
<tt class="docutils literal"><span class="pre">-Infinity</span></tt> will be encoded as such.  This behavior is not JSON
specification compliant, but is consistent with most JavaScript based
encoders and decoders.  Otherwise, it will be a <a class="reference internal" href="exceptions.html#exceptions.ValueError" title="exceptions.ValueError"><tt class="xref py py-exc docutils literal"><span class="pre">ValueError</span></tt></a> to encode
such floats.</p>
<p>If <em>sort_keys</em> is <tt class="docutils literal"><span class="pre">True</span></tt> (default <tt class="docutils literal"><span class="pre">False</span></tt>), then the output of dictionaries
will be sorted by key; this is useful for regression tests to ensure that
JSON serializations can be compared on a day-to-day basis.</p>
<p>If <em>indent</em> is a non-negative integer (it is <tt class="docutils literal"><span class="pre">None</span></tt> by default), then JSON
array elements and object members will be pretty-printed with that indent
level.  An indent level of 0 will only insert newlines.  <tt class="docutils literal"><span class="pre">None</span></tt> is the most
compact representation.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Since the default item separator is <tt class="docutils literal"><span class="pre">',</span> <span class="pre">'</span></tt>,  the output might include
trailing whitespace when <em>indent</em> is specified.  You can use
<tt class="docutils literal"><span class="pre">separators=(',',</span> <span class="pre">':</span> <span class="pre">')</span></tt> to avoid this.</p>
</div>
<p>If specified, <em>separators</em> should be an <tt class="docutils literal"><span class="pre">(item_separator,</span> <span class="pre">key_separator)</span></tt>
tuple.  The default is <tt class="docutils literal"><span class="pre">(',</span> <span class="pre">',</span> <span class="pre">':</span> <span class="pre">')</span></tt>.  To get the most compact JSON
representation, you should specify <tt class="docutils literal"><span class="pre">(',',</span> <span class="pre">':')</span></tt> to eliminate whitespace.</p>
<p>If specified, <em>default</em> is a function that gets called for objects that can&#8217;t
otherwise be serialized.  It should return a JSON encodable version of the
object or raise a <a class="reference internal" href="exceptions.html#exceptions.TypeError" title="exceptions.TypeError"><tt class="xref py py-exc docutils literal"><span class="pre">TypeError</span></tt></a>.</p>
<p>If <em>encoding</em> is not <tt class="docutils literal"><span class="pre">None</span></tt>, then all input strings will be transformed
into unicode using that encoding prior to JSON-encoding.  The default is
UTF-8.</p>
<dl class="method">
<dt id="json.JSONEncoder.default">
<tt class="descname">default</tt><big>(</big><em>o</em><big>)</big><a class="headerlink" href="#json.JSONEncoder.default" title="Permalink to this definition">¶</a></dt>
<dd><p>Implement this method in a subclass such that it returns a serializable
object for <em>o</em>, or calls the base implementation (to raise a
<a class="reference internal" href="exceptions.html#exceptions.TypeError" title="exceptions.TypeError"><tt class="xref py py-exc docutils literal"><span class="pre">TypeError</span></tt></a>).</p>
<p>For example, to support arbitrary iterators, you could implement default
like this:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">def</span> <span class="nf">default</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">o</span><span class="p">):</span>
   <span class="k">try</span><span class="p">:</span>
       <span class="n">iterable</span> <span class="o">=</span> <span class="nb">iter</span><span class="p">(</span><span class="n">o</span><span class="p">)</span>
   <span class="k">except</span> <span class="ne">TypeError</span><span class="p">:</span>
       <span class="k">pass</span>
   <span class="k">else</span><span class="p">:</span>
       <span class="k">return</span> <span class="nb">list</span><span class="p">(</span><span class="n">iterable</span><span class="p">)</span>
   <span class="c"># Let the base class default method raise the TypeError</span>
   <span class="k">return</span> <span class="n">JSONEncoder</span><span class="o">.</span><span class="n">default</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">o</span><span class="p">)</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="json.JSONEncoder.encode">
<tt class="descname">encode</tt><big>(</big><em>o</em><big>)</big><a class="headerlink" href="#json.JSONEncoder.encode" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a JSON string representation of a Python data structure, <em>o</em>.  For
example:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">JSONEncoder</span><span class="p">()</span><span class="o">.</span><span class="n">encode</span><span class="p">({</span><span class="s">&quot;foo&quot;</span><span class="p">:</span> <span class="p">[</span><span class="s">&quot;bar&quot;</span><span class="p">,</span> <span class="s">&quot;baz&quot;</span><span class="p">]})</span>
<span class="go">&#39;{&quot;foo&quot;: [&quot;bar&quot;, &quot;baz&quot;]}&#39;</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="json.JSONEncoder.iterencode">
<tt class="descname">iterencode</tt><big>(</big><em>o</em><big>)</big><a class="headerlink" href="#json.JSONEncoder.iterencode" title="Permalink to this definition">¶</a></dt>
<dd><p>Encode the given object, <em>o</em>, and yield each string representation as
available.  For example:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">for</span> <span class="n">chunk</span> <span class="ow">in</span> <span class="n">JSONEncoder</span><span class="p">()</span><span class="o">.</span><span class="n">iterencode</span><span class="p">(</span><span class="n">bigobject</span><span class="p">):</span>
    <span class="n">mysocket</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">chunk</span><span class="p">)</span>
</pre></div>
</div>
</dd></dl>

</dd></dl>

</div>
<div class="section" id="standard-compliance">
<h2>18.2.3. Standard Compliance<a class="headerlink" href="#standard-compliance" title="Permalink to this headline">¶</a></h2>
<p>The JSON format is specified by <span class="target" id="index-1"></span><a class="rfc reference external" href="http://tools.ietf.org/html/rfc4627.html"><strong>RFC 4627</strong></a>.  This section details this
module&#8217;s level of compliance with the RFC.  For simplicity,
<a class="reference internal" href="#json.JSONEncoder" title="json.JSONEncoder"><tt class="xref py py-class docutils literal"><span class="pre">JSONEncoder</span></tt></a> and <a class="reference internal" href="#json.JSONDecoder" title="json.JSONDecoder"><tt class="xref py py-class docutils literal"><span class="pre">JSONDecoder</span></tt></a> subclasses, and parameters other
than those explicitly mentioned, are not considered.</p>
<p>This module does not comply with the RFC in a strict fashion, implementing some
extensions that are valid JavaScript but not valid JSON.  In particular:</p>
<ul class="simple">
<li>Top-level non-object, non-array values are accepted and output;</li>
<li>Infinite and NaN number values are accepted and output;</li>
<li>Repeated names within an object are accepted, and only the value of the last
name-value pair is used.</li>
</ul>
<p>Since the RFC permits RFC-compliant parsers to accept input texts that are not
RFC-compliant, this module&#8217;s deserializer is technically RFC-compliant under
default settings.</p>
<div class="section" id="character-encodings">
<h3>18.2.3.1. Character Encodings<a class="headerlink" href="#character-encodings" title="Permalink to this headline">¶</a></h3>
<p>The RFC recommends that JSON be represented using either UTF-8, UTF-16, or
UTF-32, with UTF-8 being the default.  Accordingly, this module uses UTF-8 as
the default for its <em>encoding</em> parameter.</p>
<p>This module&#8217;s deserializer only directly works with ASCII-compatible encodings;
UTF-16, UTF-32, and other ASCII-incompatible encodings require the use of
workarounds described in the documentation for the deserializer&#8217;s <em>encoding</em>
parameter.</p>
<p>The RFC also non-normatively describes a limited encoding detection technique
for JSON texts; this module&#8217;s deserializer does not implement this or any other
kind of encoding detection.</p>
<p>As permitted, though not required, by the RFC, this module&#8217;s serializer sets
<em>ensure_ascii=True</em> by default, thus escaping the output so that the resulting
strings only contain ASCII characters.</p>
</div>
<div class="section" id="top-level-non-object-non-array-values">
<h3>18.2.3.2. Top-level Non-Object, Non-Array Values<a class="headerlink" href="#top-level-non-object-non-array-values" title="Permalink to this headline">¶</a></h3>
<p>The RFC specifies that the top-level value of a JSON text must be either a
JSON object or array (Python <a class="reference internal" href="stdtypes.html#dict" title="dict"><tt class="xref py py-class docutils literal"><span class="pre">dict</span></tt></a> or <a class="reference internal" href="functions.html#list" title="list"><tt class="xref py py-class docutils literal"><span class="pre">list</span></tt></a>).  This module&#8217;s
deserializer also accepts input texts consisting solely of a
JSON null, boolean, number, or string value:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">just_a_json_string</span> <span class="o">=</span> <span class="s">&#39;&quot;spam and eggs&quot;&#39;</span>  <span class="c"># Not by itself a valid JSON text</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="n">just_a_json_string</span><span class="p">)</span>
<span class="go">u&#39;spam and eggs&#39;</span>
</pre></div>
</div>
<p>This module itself does not include a way to request that such input texts be
regarded as illegal.  Likewise, this module&#8217;s serializer also accepts single
Python <a class="reference internal" href="constants.html#None" title="None"><tt class="xref py py-data docutils literal"><span class="pre">None</span></tt></a>, <a class="reference internal" href="functions.html#bool" title="bool"><tt class="xref py py-class docutils literal"><span class="pre">bool</span></tt></a>, numeric, and <a class="reference internal" href="functions.html#str" title="str"><tt class="xref py py-class docutils literal"><span class="pre">str</span></tt></a>
values as input and will generate output texts consisting solely of a top-level
JSON null, boolean, number, or string value without raising an exception:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">neither_a_list_nor_a_dict</span> <span class="o">=</span> <span class="s">u&quot;spam and eggs&quot;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">neither_a_list_nor_a_dict</span><span class="p">)</span>  <span class="c"># The result is not a valid JSON text</span>
<span class="go">&#39;&quot;spam and eggs&quot;&#39;</span>
</pre></div>
</div>
<p>This module&#8217;s serializer does not itself include a way to enforce the
aforementioned constraint.</p>
</div>
<div class="section" id="infinite-and-nan-number-values">
<h3>18.2.3.3. Infinite and NaN Number Values<a class="headerlink" href="#infinite-and-nan-number-values" title="Permalink to this headline">¶</a></h3>
<p>The RFC does not permit the representation of infinite or NaN number values.
Despite that, by default, this module accepts and outputs <tt class="docutils literal"><span class="pre">Infinity</span></tt>,
<tt class="docutils literal"><span class="pre">-Infinity</span></tt>, and <tt class="docutils literal"><span class="pre">NaN</span></tt> as if they were valid JSON number literal values:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># Neither of these calls raises an exception, but the results are not valid JSON</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="nb">float</span><span class="p">(</span><span class="s">&#39;-inf&#39;</span><span class="p">))</span>
<span class="go">&#39;-Infinity&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="nb">float</span><span class="p">(</span><span class="s">&#39;nan&#39;</span><span class="p">))</span>
<span class="go">&#39;NaN&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="c"># Same when deserializing</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="s">&#39;-Infinity&#39;</span><span class="p">)</span>
<span class="go">-inf</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="s">&#39;NaN&#39;</span><span class="p">)</span>
<span class="go">nan</span>
</pre></div>
</div>
<p>In the serializer, the <em>allow_nan</em> parameter can be used to alter this
behavior.  In the deserializer, the <em>parse_constant</em> parameter can be used to
alter this behavior.</p>
</div>
<div class="section" id="repeated-names-within-an-object">
<h3>18.2.3.4. Repeated Names Within an Object<a class="headerlink" href="#repeated-names-within-an-object" title="Permalink to this headline">¶</a></h3>
<p>The RFC specifies that the names within a JSON object should be unique, but
does not specify how repeated names in JSON objects should be handled.  By
default, this module does not raise an exception; instead, it ignores all but
the last name-value pair for a given name:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">weird_json</span> <span class="o">=</span> <span class="s">&#39;{&quot;x&quot;: 1, &quot;x&quot;: 2, &quot;x&quot;: 3}&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="n">weird_json</span><span class="p">)</span>
<span class="go">{u&#39;x&#39;: 3}</span>
</pre></div>
</div>
<p>The <em>object_pairs_hook</em> parameter can be used to alter this behavior.</p>
</div>
</div>
</div>


          </div>
        </div>
      </div>
      <div class="sphinxsidebar">
        <div class="sphinxsidebarwrapper">
  <h3><a href="../contents.html">Table Of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#">18.2. <tt class="docutils literal"><span class="pre">json</span></tt> &#8212; JSON encoder and decoder</a><ul>
<li><a class="reference internal" href="#basic-usage">18.2.1. Basic Usage</a></li>
<li><a class="reference internal" href="#encoders-and-decoders">18.2.2. Encoders and Decoders</a></li>
<li><a class="reference internal" href="#standard-compliance">18.2.3. Standard Compliance</a><ul>
<li><a class="reference internal" href="#character-encodings">18.2.3.1. Character Encodings</a></li>
<li><a class="reference internal" href="#top-level-non-object-non-array-values">18.2.3.2. Top-level Non-Object, Non-Array Values</a></li>
<li><a class="reference internal" href="#infinite-and-nan-number-values">18.2.3.3. Infinite and NaN Number Values</a></li>
<li><a class="reference internal" href="#repeated-names-within-an-object">18.2.3.4. Repeated Names Within an Object</a></li>
</ul>
</li>
</ul>
</li>
</ul>

  <h4>Previous topic</h4>
  <p class="topless"><a href="email-examples.html"
                        title="previous chapter">18.1.11. <tt class="docutils literal"><span class="pre">email</span></tt>: Examples</a></p>
  <h4>Next topic</h4>
  <p class="topless"><a href="mailcap.html"
                        title="next chapter">18.3. <tt class="docutils literal"><span class="pre">mailcap</span></tt> &#8212; Mailcap file handling</a></p>
<h3>This Page</h3>
<ul class="this-page-menu">
  <li><a href="../bugs.html">Report a Bug</a></li>
  <li><a href="../_sources/library/json.txt"
         rel="nofollow">Show Source</a></li>
</ul>

<div id="searchbox" style="display: none">
  <h3>Quick search</h3>
    <form class="search" action="../search.html" method="get">
      <input type="text" name="q" />
      <input type="submit" value="Go" />
      <input type="hidden" name="check_keywords" value="yes" />
      <input type="hidden" name="area" value="default" />
    </form>
    <p class="searchtip" style="font-size: 90%">
    Enter search terms or a module, class or function name.
    </p>
</div>
<script type="text/javascript">$('#searchbox').show(0);</script>
        </div>
      </div>
      <div class="clearer"></div>
    </div>
    <div class="related">
      <h3>Navigation</h3>
      <ul>
        <li class="right" style="margin-right: 10px">
          <a href="../genindex.html" title="General Index"
             >index</a></li>
        <li class="right" >
          <a href="../py-modindex.html" title="Python Module Index"
             >modules</a> |</li>
        <li class="right" >
          <a href="mailcap.html" title="18.3. mailcap — Mailcap file handling"
             >next</a> |</li>
        <li class="right" >
          <a href="email-examples.html" title="18.1.11. email: Examples"
             >previous</a> |</li>
        <li><img src="../_static/py.png" alt=""
                 style="vertical-align: middle; margin-top: -1px"/></li>
        <li><a href="http://www.python.org/">Python</a> &raquo;</li>
        <li>
          <a href="../index.html">Python 2.7.5 documentation</a> &raquo;
        </li>

          <li><a href="index.html" >The Python Standard Library</a> &raquo;</li>
          <li><a href="netdata.html" >18. Internet Data Handling</a> &raquo;</li> 
      </ul>
    </div>
    <div class="footer">
    &copy; <a href="../copyright.html">Copyright</a> 1990-2020, Python Software Foundation.
    <br />
    The Python Software Foundation is a non-profit corporation.
    <a href="http://www.python.org/psf/donations/">Please donate.</a>
    <br />
    Last updated on Oct 13, 2020.
    <a href="../bugs.html">Found a bug</a>?
    <br />
    Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.1.3.
    </div>

  </body>
</html>