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POmod_wsgi python can't import from standard library
 

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    <p>I have created two python environments with virtualenv: <code>/usr/local/pythonenv/BASELINE</code> and <code>/usr/local/pythonenv/django1</code>. Both were created with --no-site-packages. I installed django to the django1 environment with easy_install.</p> <p>My wsgi.conf file has this line to set the Python interpreter:</p> <pre><code>WSGIPythonHome /usr/local/pythonenv/BASELINE </code></pre> <p>My django.wsgi file starts like:</p> <pre><code>import site site.addsitedir('/usr/local/pythonenv/django1/lib/python2.7/site-packages') import os import sys </code></pre> <p>But when I try to visit my site, I get a 500 Error, and httpd/error_log contains:</p> <pre><code>[error] Traceback (most recent call last): [error] File "/service/usr/local/django_apps/apache/django.wsgi", line 1, in ? [error] import site [error] ImportError: No module named site </code></pre> <p>I am lost as to why the Python interpreter can't import its own standard library. I'm not even sure how to check if httpd is even using the interpreter in /usr/local/pythonenv/BASELINE, so that would be a good start.</p> <p>Edit: Unrelated but I was quite torn on whether I should post this here or to ServerFault. Advice on that front appreciated.</p> <p>Edit: So I was able to get some debug information thanks to <a href="http://code.google.com/p/modwsgi/wiki/DebuggingTechniques" rel="nofollow">http://code.google.com/p/modwsgi/wiki/DebuggingTechniques</a>. I changed my django.wsgi script to contain </p> <pre><code>import sys def application(environ, start_response): status = '200 OK' output = 'Hello World!' print &gt;&gt; environ['wsgi.errors'], sys.path print &gt;&gt; environ['wsgi.errors'], sys.prefix print &gt;&gt; environ['wsgi.errors'], sys.executable response_headers = [('Content-type', 'text/plain'), ('Content-Length', str(len(output)))] start_response(status, response_headers) return [output] </code></pre> <p>This put the Python interpreter information in /var/log/httpd/error_log. The error output:</p> <pre><code>[error] ['/usr/local/pythonenv/BASELINE/lib64/python24.zip', '/usr/local/pythonenv/BASELINE/lib64/python2.4/', '/usr/local/pythonenv/BASELINE/lib64/python2.4/plat-linux2', '/usr/local/pythonenv/BASELINE/lib64/python2.4/lib-tk', '/usr/local/pythonenv/BASELINE/lib64/python2.4/lib-dynload'] [error] /usr/local/pythonenv/BASELINE [error] /usr/bin/python </code></pre> <p>So sys.path and sys.executable point to my problem. For some reason sys.path is using some lib files that do not exist (BASELINE does not even contain a lib64 directory, and it was created with Python2.7), and sys.executable shows that mod_wsgi is still running the default /usr/bin/python interpreter, not the interpreter in /usr/local/pythonenv/BASELINE/bin.</p> <p>Not sure why this is the case, but at least I know a bit more now.</p> <p>EDIT: This is solved, but Django still lists "Python Executable: /usr/bin/python" even though it should be (and as far as I can tell, it is, since Python Version: 2.7.2) using /usr/local/bin/python. Is this normal?</p>
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