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<?xml version="1.0" encoding="ascii"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
          "DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
  <title>abc.ABCMeta</title>
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  <script type="text/javascript" src="epydoc.js"></script>
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        abc ::
        ABCMeta ::
        Class&nbsp;ABCMeta
      </span>
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        <!-- hide/show private -->
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<!-- ==================== TYPE DESCRIPTION ==================== -->
<h1 class="epydoc">Type ABCMeta</h1><p class="nomargin-top"></p>
<pre class="base-tree">
object --+    
         |    
      type --+
             |
            <strong class="uidshort">ABCMeta</strong>
</pre>

<hr />
<p>Metaclass for defining Abstract Base Classes (ABCs).</p>
  <p>Use this metaclass to create an ABC.  An ABC can be subclassed 
  directly, and then acts as a mix-in class.  You can also register 
  unrelated concrete classes (even built-in classes) and unrelated ABCs as 
  'virtual subclasses' -- these and their descendants will be considered 
  subclasses of the registering ABC by the built-in issubclass() function, 
  but the registering ABC won't show up in their MRO (Method Resolution 
  Order) nor will method implementations defined by the registering ABC be 
  callable (not even via super()).</p>

<!-- ==================== INSTANCE METHODS ==================== -->
<a name="section-InstanceMethods"></a>
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         ><span class="options">[<a href="#section-InstanceMethods"
         class="privatelink" onclick="toggle_private();"
         >hide private</a>]</span></td>
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<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">check if an object is an instance</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="abc.ABCMeta-class.html#__instancecheck__" class="summary-sig-name">__instancecheck__</a>(<span class="summary-sig-arg">cls</span>,
        <span class="summary-sig-arg">instance</span>)</span><br />
      Override for isinstance(instance, cls).</td>
          <td align="right" valign="top">
            
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
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      <span class="summary-type">check if a class is a subclass</span>
    </td><td class="summary">
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        <tr>
          <td><span class="summary-sig"><a href="abc.ABCMeta-class.html#__subclasscheck__" class="summary-sig-name">__subclasscheck__</a>(<span class="summary-sig-arg">cls</span>,
        <span class="summary-sig-arg">subclass</span>)</span><br />
      Override for issubclass(subclass, cls).</td>
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          </td>
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      <span class="summary-type">&nbsp;</span>
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      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a name="_dump_registry"></a><span class="summary-sig-name">_dump_registry</span>(<span class="summary-sig-arg">cls</span>,
        <span class="summary-sig-arg">file</span>=<span class="summary-sig-default">None</span>)</span><br />
      Debug helper to print the ABC registry.</td>
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          </td>
        </tr>
      </table>
      
    </td>
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<tr>
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      <span class="summary-type">&nbsp;</span>
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      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a name="register"></a><span class="summary-sig-name">register</span>(<span class="summary-sig-arg">cls</span>,
        <span class="summary-sig-arg">subclass</span>)</span><br />
      Register a virtual subclass of an ABC.</td>
          <td align="right" valign="top">
            
            
          </td>
        </tr>
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    </td>
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  <tr>
    <td colspan="2" class="summary">
    <p class="indent-wrapped-lines"><b>Inherited from <code>type</code></b>:
      <code>__call__</code>,
      <code>__delattr__</code>,
      <code>__eq__</code>,
      <code>__ge__</code>,
      <code>__getattribute__</code>,
      <code>__gt__</code>,
      <code>__hash__</code>,
      <code>__init__</code>,
      <code>__le__</code>,
      <code>__lt__</code>,
      <code>__ne__</code>,
      <code>__repr__</code>,
      <code>__setattr__</code>,
      <code>__subclasses__</code>,
      <code>mro</code>
      </p>
    <p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
      <code>__format__</code>,
      <code>__reduce__</code>,
      <code>__reduce_ex__</code>,
      <code>__sizeof__</code>,
      <code>__str__</code>,
      <code>__subclasshook__</code>
      </p>
    </td>
  </tr>
</table>
<!-- ==================== STATIC METHODS ==================== -->
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      <span class="summary-type">a new object with type S, a subtype of T</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="abc.ABCMeta-class.html#__new__" class="summary-sig-name">__new__</a>(<span class="summary-sig-arg">mcls</span>,
        <span class="summary-sig-arg">name</span>,
        <span class="summary-sig-arg">bases</span>,
        <span class="summary-sig-arg">namespace</span>)</span></td>
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<!-- ==================== CLASS VARIABLES ==================== -->
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      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
        <a name="_abc_invalidation_counter"></a><span class="summary-name">_abc_invalidation_counter</span> = <code title="10">10</code>
    </td>
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<!-- ==================== PROPERTIES ==================== -->
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         >hide private</a>]</span></td>
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  <tr>
    <td colspan="2" class="summary">
    <p class="indent-wrapped-lines"><b>Inherited from <code>type</code></b>:
      <code>__abstractmethods__</code>,
      <code>__base__</code>,
      <code>__bases__</code>,
      <code>__basicsize__</code>,
      <code>__dictoffset__</code>,
      <code>__flags__</code>,
      <code>__itemsize__</code>,
      <code>__mro__</code>,
      <code>__name__</code>,
      <code>__weakrefoffset__</code>
      </p>
    <p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
      <code>__class__</code>
      </p>
    </td>
  </tr>
</table>
<!-- ==================== METHOD DETAILS ==================== -->
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         class="privatelink" onclick="toggle_private();"
         >hide private</a>]</span></td>
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<a name="__instancecheck__"></a>
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  <table width="100%" cellpadding="0" cellspacing="0" border="0">
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  <h3 class="epydoc"><span class="sig"><span class="sig-name">__instancecheck__</span>(<span class="sig-arg">cls</span>,
        <span class="sig-arg">instance</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    >&nbsp;
    </td>
  </tr></table>
  
  <p>Override for isinstance(instance, cls).</p>
  <dl class="fields">
    <dt>Returns: check if an object is an instance</dt>
    <dt>Overrides:
        type.__instancecheck__
    </dt>
  </dl>
</td></tr></table>
</div>
<a name="__new__"></a>
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  <h3 class="epydoc"><span class="sig"><span class="sig-name">__new__</span>(<span class="sig-arg">mcls</span>,
        <span class="sig-arg">name</span>,
        <span class="sig-arg">bases</span>,
        <span class="sig-arg">namespace</span>)</span>
    <br /><em class="fname">Static Method</em>
  </h3>
  </td><td align="right" valign="top"
    >&nbsp;
    </td>
  </tr></table>
  
  
  <dl class="fields">
    <dt>Returns: a new object with type S, a subtype of T</dt>
    <dt>Overrides:
        object.__new__
        <dd><em class="note">(inherited documentation)</em></dd>
    </dt>
  </dl>
</td></tr></table>
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  <h3 class="epydoc"><span class="sig"><span class="sig-name">__subclasscheck__</span>(<span class="sig-arg">cls</span>,
        <span class="sig-arg">subclass</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    >&nbsp;
    </td>
  </tr></table>
  
  <p>Override for issubclass(subclass, cls).</p>
  <dl class="fields">
    <dt>Returns: check if a class is a subclass</dt>
    <dt>Overrides:
        type.__subclasscheck__
    </dt>
  </dl>
</td></tr></table>
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