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<p>
Extension Class</p>
<p> <a href="COPYRIGHT.html">Copyright (C) 1996-1998, Digital Creations</a>.</p>
<p> A lightweight mechanism has been developed for making Python
extension types more class-like. Classes can be developed in an
extension language, such as C or C++, and these classes can be
treated like other python classes:</p>
<ul><li><p>They can be sub-classed in python,</p>
<li><p>They provide access to method documentation strings, and</p>
<li><p>They can be used to directly create new instances.</p>
</ul>
<p> Extension classes provide additional extensions to class and
instance semantics, including:</p>
<ul><li><p>A protocol for accessing subobjects "in the context of" their
containers. This is used to implement custom method types
and <a href="Acquisition.html">environmental acquisition</a>.</p>
<li><p>A protocol for overriding method call semantics. This is used
to implement "synchonized" classes and could be used to
implement argument type checking.</p>
<li><p>A protocol for class initialization that supports execution of a
special <code>__class_init__</code> method after a class has been
initialized.</p>
</ul>
<p> Extension classes illustrate how the Python class mechanism can be
extended and may provide a basis for improved or specialized class
models. </p>
<h1>Releases</h1>
<p> The current release is <a href="ExtensionClass-1.2.tar.gz">1.2</a>
To find out what's changed in this release,
see the <a href="release.html">release notes</a>.</p>
<p> Documentation is available <a href="ExtensionClass.html">on-line</a>.</p>
<h1>Windows Binaries</h1>
<p> A win32 binary release, <a href="ec12.zip">ec12.zip</a> is available. This
release includes all of the ExtensionClass modules built as
Windows extension modules (.pyd) files. These were built for
Python 1.5.1 using Microsoft Visual C++ 5.0 in "Release" mode.</p>
<p>
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