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<!-- ==================== MODULE DESCRIPTION ==================== -->
<h1 class="epydoc">Module core</h1><p class="nomargin-top"></p>
Core locale representation and locale data access.

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        <a href="babel.core.UnknownLocaleError-class.html" class="summary-name">UnknownLocaleError</a><br />
      Exception thrown when a locale is requested for which no locale data
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      <span class="summary-type">&nbsp;</span>
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        <a href="babel.core.Locale-class.html" class="summary-name">Locale</a><br />
      Representation of a specific locale.
    </td>
  </tr>
</table>
<!-- ==================== FUNCTIONS ==================== -->
<a name="section-Functions"></a>
<table class="summary" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
  <td align="left" colspan="2" class="table-header">
    <span class="table-header">Functions</span></td>
</tr>
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    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type"><code class="link">str</code></span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="babel.core-module.html#default_locale" class="summary-sig-name">default_locale</a>(<span class="summary-sig-arg">category</span>=<span class="summary-sig-default">None</span>,
        <span class="summary-sig-arg">aliases</span>=<span class="summary-sig-default"><code class="variable-group">{</code><code class="variable-quote">'</code><code class="variable-string">ar</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-quote">'</code><code class="variable-string">ar_SY</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">bg</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-quote">'</code><code class="variable-string">bg_BG</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">bs</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-quote">'</code><code class="variable-string">bs_BA</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">ca</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-quote">'</code><code class="variable-string">ca_ES</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-ellipsis">...</code></span>)</span><br />
      Returns the system default locale for a given category, based on
environment variables.</td>
          <td align="right" valign="top">
            
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type"><code class="link">str</code></span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="babel.core-module.html#negotiate_locale" class="summary-sig-name">negotiate_locale</a>(<span class="summary-sig-arg">preferred</span>,
        <span class="summary-sig-arg">available</span>,
        <span class="summary-sig-arg">sep</span>=<span class="summary-sig-default"><code class="variable-quote">'</code><code class="variable-string">_</code><code class="variable-quote">'</code></span>,
        <span class="summary-sig-arg">aliases</span>=<span class="summary-sig-default"><code class="variable-group">{</code><code class="variable-quote">'</code><code class="variable-string">ar</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-quote">'</code><code class="variable-string">ar_SY</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">bg</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-quote">'</code><code class="variable-string">bg_BG</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">bs</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-quote">'</code><code class="variable-string">bs_BA</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">ca</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-quote">'</code><code class="variable-string">ca_ES</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-ellipsis">...</code></span>)</span><br />
      Find the best match between available and requested locale strings.</td>
          <td align="right" valign="top">
            
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type"><code class="link">tuple</code></span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="babel.core-module.html#parse_locale" class="summary-sig-name">parse_locale</a>(<span class="summary-sig-arg">identifier</span>,
        <span class="summary-sig-arg">sep</span>=<span class="summary-sig-default"><code class="variable-quote">'</code><code class="variable-string">_</code><code class="variable-quote">'</code></span>)</span><br />
      Parse a locale identifier into a tuple of the form:</td>
          <td align="right" valign="top">
            
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
</table>
<!-- ==================== FUNCTION DETAILS ==================== -->
<a name="section-FunctionDetails"></a>
<table class="details" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
  <td align="left" colspan="2" class="table-header">
    <span class="table-header">Function Details</span></td>
</tr>
</table>
<a name="default_locale"></a>
<div>
<table class="details" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr><td>
  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">default_locale</span>(<span class="sig-arg">category</span>=<span class="sig-default">None</span>,
        <span class="sig-arg">aliases</span>=<span class="sig-default"><code class="variable-group">{</code><code class="variable-quote">'</code><code class="variable-string">ar</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-quote">'</code><code class="variable-string">ar_SY</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">bg</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-quote">'</code><code class="variable-string">bg_BG</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">bs</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-quote">'</code><code class="variable-string">bs_BA</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">ca</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-quote">'</code><code class="variable-string">ca_ES</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-ellipsis">...</code></span>)</span>
  </h3>
  </td><td align="right" valign="top"
    >&nbsp;
    </td>
  </tr></table>
  
  <p>Returns the system default locale for a given category, based on
environment variables.</p>
<pre class="py-doctest">
<span class="py-prompt">&gt;&gt;&gt; </span><span class="py-keyword">for</span> name <span class="py-keyword">in</span> [<span class="py-string">'LANGUAGE'</span>, <span class="py-string">'LC_ALL'</span>, <span class="py-string">'LC_CTYPE'</span>]:
<span class="py-more">... </span>    os.environ[name] = <span class="py-string">''</span>
<span class="py-prompt">&gt;&gt;&gt; </span>os.environ[<span class="py-string">'LANG'</span>] = <span class="py-string">'fr_FR.UTF-8'</span>
<span class="py-prompt">&gt;&gt;&gt; </span>default_locale(<span class="py-string">'LC_MESSAGES'</span>)
<span class="py-output">'fr_FR'</span></pre>
<p>The &quot;C&quot; or &quot;POSIX&quot; pseudo-locales are treated as aliases for the
&quot;en_US_POSIX&quot; locale:</p>
<pre class="py-doctest">
<span class="py-prompt">&gt;&gt;&gt; </span>os.environ[<span class="py-string">'LC_MESSAGES'</span>] = <span class="py-string">'POSIX'</span>
<span class="py-prompt">&gt;&gt;&gt; </span>default_locale(<span class="py-string">'LC_MESSAGES'</span>)
<span class="py-output">'en_US_POSIX'</span></pre>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>category</code></strong> - one of the <tt class="rst-docutils literal">LC_XXX</tt> environment variable names</li>
        <li><strong class="pname"><code>aliases</code></strong> - a dictionary of aliases for locale identifiers</li>
    </ul></dd>
    <dt>Returns: <code class="link">str</code></dt>
        <dd>the value of the variable, or any of the fallbacks (<tt class="rst-docutils literal">LANGUAGE</tt>,
<tt class="rst-docutils literal">LC_ALL</tt>, <tt class="rst-docutils literal">LC_CTYPE</tt>, and <tt class="rst-docutils literal">LANG</tt>)</dd>
  </dl>
</td></tr></table>
</div>
<a name="negotiate_locale"></a>
<div>
<table class="details" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr><td>
  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">negotiate_locale</span>(<span class="sig-arg">preferred</span>,
        <span class="sig-arg">available</span>,
        <span class="sig-arg">sep</span>=<span class="sig-default"><code class="variable-quote">'</code><code class="variable-string">_</code><code class="variable-quote">'</code></span>,
        <span class="sig-arg">aliases</span>=<span class="sig-default"><code class="variable-group">{</code><code class="variable-quote">'</code><code class="variable-string">ar</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-quote">'</code><code class="variable-string">ar_SY</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">bg</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-quote">'</code><code class="variable-string">bg_BG</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">bs</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-quote">'</code><code class="variable-string">bs_BA</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">ca</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-quote">'</code><code class="variable-string">ca_ES</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-ellipsis">...</code></span>)</span>
  </h3>
  </td><td align="right" valign="top"
    >&nbsp;
    </td>
  </tr></table>
  
  <p>Find the best match between available and requested locale strings.</p>
<pre class="py-doctest">
<span class="py-prompt">&gt;&gt;&gt; </span>negotiate_locale([<span class="py-string">'de_DE'</span>, <span class="py-string">'en_US'</span>], [<span class="py-string">'de_DE'</span>, <span class="py-string">'de_AT'</span>])
<span class="py-output">'de_DE'</span>
<span class="py-output"></span><span class="py-prompt">&gt;&gt;&gt; </span>negotiate_locale([<span class="py-string">'de_DE'</span>, <span class="py-string">'en_US'</span>], [<span class="py-string">'en'</span>, <span class="py-string">'de'</span>])
<span class="py-output">'de'</span></pre>
<p>Case is ignored by the algorithm, the result uses the case of the preferred
locale identifier:</p>
<pre class="py-doctest">
<span class="py-prompt">&gt;&gt;&gt; </span>negotiate_locale([<span class="py-string">'de_DE'</span>, <span class="py-string">'en_US'</span>], [<span class="py-string">'de_de'</span>, <span class="py-string">'de_at'</span>])
<span class="py-output">'de_DE'</span></pre>
<pre class="py-doctest">
<span class="py-prompt">&gt;&gt;&gt; </span>negotiate_locale([<span class="py-string">'de_DE'</span>, <span class="py-string">'en_US'</span>], [<span class="py-string">'de_de'</span>, <span class="py-string">'de_at'</span>])
<span class="py-output">'de_DE'</span></pre>
<p>By default, some web browsers unfortunately do not include the territory
in the locale identifier for many locales, and some don't even allow the
user to easily add the territory. So while you may prefer using qualified
locale identifiers in your web-application, they would not normally match
the language-only locale sent by such browsers. To workaround that, this
function uses a default mapping of commonly used langauge-only locale
identifiers to identifiers including the territory:</p>
<pre class="py-doctest">
<span class="py-prompt">&gt;&gt;&gt; </span>negotiate_locale([<span class="py-string">'ja'</span>, <span class="py-string">'en_US'</span>], [<span class="py-string">'ja_JP'</span>, <span class="py-string">'en_US'</span>])
<span class="py-output">'ja_JP'</span></pre>
<p>Some browsers even use an incorrect or outdated language code, such as &quot;no&quot;
for Norwegian, where the correct locale identifier would actually be &quot;nb_NO&quot;
(Bokm&#229;l) or &quot;nn_NO&quot; (Nynorsk). The aliases are intended to take care of
such cases, too:</p>
<pre class="py-doctest">
<span class="py-prompt">&gt;&gt;&gt; </span>negotiate_locale([<span class="py-string">'no'</span>, <span class="py-string">'sv'</span>], [<span class="py-string">'nb_NO'</span>, <span class="py-string">'sv_SE'</span>])
<span class="py-output">'nb_NO'</span></pre>
<p>You can override this default mapping by passing a different <code class="link">aliases</code>
dictionary to this function, or you can bypass the behavior althogher by
setting the <code class="link">aliases</code> parameter to <code class="link">None</code>.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>preferred</code></strong> - the list of locale strings preferred by the user</li>
        <li><strong class="pname"><code>available</code></strong> - the list of locale strings available</li>
        <li><strong class="pname"><code>sep</code></strong> - character that separates the different parts of the locale
strings</li>
        <li><strong class="pname"><code>aliases</code></strong> - a dictionary of aliases for locale identifiers</li>
    </ul></dd>
    <dt>Returns: <code class="link">str</code></dt>
        <dd>the locale identifier for the best match, or <code class="link">None</code> if no match
was found</dd>
  </dl>
</td></tr></table>
</div>
<a name="parse_locale"></a>
<div>
<table class="details" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr><td>
  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">parse_locale</span>(<span class="sig-arg">identifier</span>,
        <span class="sig-arg">sep</span>=<span class="sig-default"><code class="variable-quote">'</code><code class="variable-string">_</code><code class="variable-quote">'</code></span>)</span>
  </h3>
  </td><td align="right" valign="top"
    >&nbsp;
    </td>
  </tr></table>
  
  <p>Parse a locale identifier into a tuple of the form:</p>
<pre class="rst-literal-block">
``(language, territory, script, variant)``
</pre>
<pre class="py-doctest">
<span class="py-prompt">&gt;&gt;&gt; </span>parse_locale(<span class="py-string">'zh_CN'</span>)
<span class="py-output">('zh', 'CN', None, None)</span>
<span class="py-output"></span><span class="py-prompt">&gt;&gt;&gt; </span>parse_locale(<span class="py-string">'zh_Hans_CN'</span>)
<span class="py-output">('zh', 'CN', 'Hans', None)</span></pre>
<p>The default component separator is &quot;_&quot;, but a different separator can be
specified using the <code class="link">sep</code> parameter:</p>
<pre class="py-doctest">
<span class="py-prompt">&gt;&gt;&gt; </span>parse_locale(<span class="py-string">'zh-CN'</span>, sep=<span class="py-string">'-'</span>)
<span class="py-output">('zh', 'CN', None, None)</span></pre>
<p>If the identifier cannot be parsed into a locale, a <code class="link">ValueError</code> exception
is raised:</p>
<pre class="py-doctest">
<span class="py-prompt">&gt;&gt;&gt; </span>parse_locale(<span class="py-string">'not_a_LOCALE_String'</span>)
<span class="py-except">Traceback (most recent call last):</span>
<span class="py-except">  ...</span>
<span class="py-except">ValueError: 'not_a_LOCALE_String' is not a valid locale identifier</span></pre>
<p>Encoding information and locale modifiers are removed from the identifier:</p>
<pre class="py-doctest">
<span class="py-prompt">&gt;&gt;&gt; </span>parse_locale(<span class="py-string">'it_IT@euro'</span>)
<span class="py-output">('it', 'IT', None, None)</span>
<span class="py-output"></span><span class="py-prompt">&gt;&gt;&gt; </span>parse_locale(<span class="py-string">'en_US.UTF-8'</span>)
<span class="py-output">('en', 'US', None, None)</span>
<span class="py-output"></span><span class="py-prompt">&gt;&gt;&gt; </span>parse_locale(<span class="py-string">'de_DE.iso885915@euro'</span>)
<span class="py-output">('de', 'DE', None, None)</span></pre>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>identifier</code></strong> - the locale identifier string</li>
        <li><strong class="pname"><code>sep</code></strong> - character that separates the different components of the locale
identifier</li>
    </ul></dd>
    <dt>Returns: <code class="link">tuple</code></dt>
        <dd>the <tt class="rst-docutils literal">(language, territory, script, variant)</tt> tuple</dd>
    <dt>Raises:</dt>
    <dd><ul class="nomargin-top">
        <li><code><strong class='fraise'>ValueError</strong></code> - if the string does not appear to be a valid locale
identifier</li>
    </ul></dd>
  </dl>
<div class="fields">      <p><strong>See Also:</strong>
        <a class="rst-reference external" href="http://www.ietf.org/rfc/rfc4646.txt" target="_top">IETF RFC 4646</a>
      </p>
</div></td></tr></table>
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