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copied!<p>If you want to load python code dynamically from different locations, you can extend the search __path__ attributes by using the <a href="http://docs.python.org/library/pkgutil.html#pkgutil.extend_path" rel="nofollow">pkgutil module</a>:</p> <p>By placing these lines into each <code>pydraw/__init__.py</code> and <code>pydraw/shapes/__init__.py</code>:</p> <pre><code>from pkgutil import extend_path __path__ = extend_path(__path__, __name__) </code></pre> <p>You will be able to write import statement as if you had a unique package:</p> <pre><code>>>> import pydraw.shapes >>> pydraw.shapes.__path__ ['/usr/lib/python/pydraw/shapes', '/home/someuser/python/pydraw/shapes'] >>> from pydraw.shapes import circle, square >>> </code></pre> <p>You may think about auto-registration of your plugins. You can still use basic python code for that by setting a module variable (which will act as a kind of singleton pattern).</p> <p>Add the last line in every <code>pydraw/shapes/__init__.py</code> file:</p> <pre><code> from pkgutil import extend_path __path__ = extend_path(__path__, __name__) # your shape registry __shapes__ = [] </code></pre> <p>You can now register a shape in top of its related module (<code>circle.py</code> or <code>square.py</code> here).</p> <pre><code> from pydraw.shapes import __shapes__ __shapes__.append(__name__) </code></pre> <p>Last check:</p> <pre><code> >>> from pydraw.shapes import circle,square >>> from pydraw.shapes import circle,square,__shapes__ >>> __shapes__ ['pydraw.shapes.circle', 'pydraw.shapes.square'] </code></pre>

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