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POHow do I install a Python extension module using distutils?
 

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  1. POHow do I install a Python extension module using distutils?
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    <p>I'm working on a Python package named "lehmer" that includes a bunch of extension modules written in C. Currently, I have a single extension module, "rng". I am using Python's Distutils to build and install the module. I can compile and install the module, but when I try to import the module using <code>import lehmer.rng</code> or <code>from lehmer import rng</code>, the Python interpreter throws an <code>ImportError</code> exception. I can import "lehmer" fine.</p> <p>Here are the contents of my <code>setup.py</code> file:</p> <pre><code>from distutils.core import setup, Extension exts = [Extension("rng", ["lehmer/rng.c"])] setup(name="lehmer", version="0.1", description="A Lehmer random number generator", author="Steve Park, Dave Geyer, and Michael Dippery", maintainer="Michael Dippery", maintainer_email="mpd@cs.wm.edu", packages=["lehmer"], ext_package="lehmer", ext_modules=exts) </code></pre> <p>When I list the contents of Python's <code>site-packages</code> directory, I see the following:</p> <pre><code>th107c-4 lehmer $ ls /scratch/usr/lib64/python2.5/site-packages/lehmer __init__.py __init__.pyc rng.so* </code></pre> <p>My <code>PYTHONPATH</code> environment variable is set correctly, so that's not the problem (and as noted before, I can <code>import lehmer</code> just fine, so I <em>know</em> that <code>PYTHONPATH</code> is not the issue). Python uses the following search paths (as reported by <code>sys.path</code>):</p> <pre><code>['', '/scratch/usr/lib64/python2.5/site-packages', '/usr/lib/python25.zip', '/usr/lib64/python2.5', '/usr/lib64/python2.5/plat-linux2', '/usr/lib64/python2.5/lib-tk', '/usr/lib64/python2.5/lib-dynload', '/usr/lib64/python2.5/site-packages', '/usr/lib64/python2.5/site-packages/Numeric', '/usr/lib64/python2.5/site-packages/PIL', '/usr/lib64/python2.5/site-packages/SaX', '/usr/lib64/python2.5/site-packages/gtk-2.0', '/usr/lib64/python2.5/site-packages/wx-2.8-gtk2-unicode', '/usr/local/lib64/python2.5/site-packages'] </code></pre> <h2>Update</h2> <p>It works when used on an OpenSUSE 10 box, but the C extensions still fail to load when tested on Mac OS X. Here are the results from the Python interpreter:</p> <pre><code>&gt;&gt;&gt; sys.path ['', '/usr/local/lib/python2.5/site-packages', '/opt/local/lib/python25.zip', '/opt/local/lib/python2.5', '/opt/local/lib/python2.5/plat-darwin', '/opt/local/lib/python2.5/plat-mac', '/opt/local/lib/python2.5/plat-mac/lib-scriptpackages', '/opt/local/lib/python2.5/lib-tk', '/opt/local/lib/python2.5/lib-dynload', '/opt/local/lib/python2.5/site-packages'] &gt;&gt;&gt; from lehmer import rng Traceback (most recent call last): File "&lt;stdin&gt;", line 1, in &lt;module&gt; ImportError: cannot import name rng &gt;&gt;&gt; import lehmer.rngs Traceback (most recent call last): File "&lt;stdin&gt;", line 1, in &lt;module&gt; ImportError: No module named rngs &gt;&gt;&gt; import lehmer.rng Traceback (most recent call last): File "&lt;stdin&gt;", line 1, in &lt;module&gt; ImportError: No module named rng &gt;&gt;&gt; from lehmer import rngs Traceback (most recent call last): File "&lt;stdin&gt;", line 1, in &lt;module&gt; ImportError: cannot import name rngs </code></pre>
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    1. COActually, you don't know that PYTHONPATH is set correctly. Your local directory is always first on the sys.path list. Could you run Python and run 'import sys; print sys.path` and add that to your question?
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    2. COsorry for the stupid question, but what exactly is the ImportError's message? iirc ImportErrors are thrown for problems when loading extension modules so it could be caused by forgetting to link a library fex.
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    3. COWhoa! When I tried to import it again, it magically worked. I swear I didn't touch anything, or do anything differently than what I had been doing...although I guess I must've done something differently. Cookie to anyone who might offer an explanation as to why. :)
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