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POVirtualenv using system packages when it should not
 

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  1. POVirtualenv using system packages when it should not
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    <p>I created a virtualenv environment with the --no-site-packages option. After activating the virtualenv, I noticed that importing psycopg2 at the "python" prompt would import the out of date system library I have but importing it at the "python2.6" prompt would import the newer version of the library I installed into the virtualenv. </p> <p>Why is this? How can I only work with the virtualenv packages when I have a virtualenv activated? </p> <p>I am on OS X, if it matters. </p> <p>Edit in response to Jeff's comments below:</p> <p>There are both "python" and "python2.6" executables in my virtualenv /bin directory. "python2.6" is a symbolic link to "python" and "python" is a binary.</p> <pre><code>(ice_development)[jacob@Beagle:~] $ ls -l Virtualenv/ice_development/bin/ total 264 -rw-r--r-- 1 jacob staff 2086 Sep 8 18:13 activate ..... -rwxr-xr-x 1 jacob staff 50720 Sep 8 18:13 python lrwxr-xr-x 1 jacob staff 6 Sep 8 18:13 python2.6 -&gt; python </code></pre> <p>With the ENV activated, "which python" and "which python2.6" both point to the ENV directory.</p> <pre><code>(ice_development)[jacob@Beagle:~] $ which python /Users/jacob/Virtualenv/ice_development/bin/python (ice_development)[jacob@Beagle:~] $ which python2.6 /Users/jacob/Virtualenv/ice_development/bin/python2.6 (ice_development)[jacob@Beagle:~] $ </code></pre> <p>Moreover, the prompt is identical after using the executables at the command line. </p> <pre><code>(ice_development)[jacob@Beagle:~] $ python2.6 Python 2.6.1 (r261:67515, Feb 11 2010, 00:51:29) [GCC 4.2.1 (Apple Inc. build 5646)] on darwin Type "help", "copyright", "credits" or "license" for more information. &gt;&gt;&gt; import psycopg2 &gt;&gt;&gt; psycopg2.__version__ '2.2.2 (dt dec ext pq3)' &gt;&gt;&gt; quit() (ice_development)[jacob@Beagle:~] $ python Python 2.6.1 (r261:67515, Feb 11 2010, 00:51:29) [GCC 4.2.1 (Apple Inc. build 5646)] on darwin Type "help", "copyright", "credits" or "license" for more information. &gt;&gt;&gt; import psycopg2 &gt;&gt;&gt; psycopg2.__version__ '2.0.13 (dt dec ext pq3)' &gt;&gt;&gt; quit() </code></pre> <p>The ~/ENV/lib/python2.6/site-packages directory contains the NEW version of psycopg2 (2.2.2):</p> <pre><code>(ice_development)[jacob@Beagle:~] $ ls Virtualenv/ice_development/lib/python2.6/site- packages/ Twisted-10.1.0-py2.6-macosx-10.6-universal.egg setuptools-0.6c11-py2.6.egg easy-install.pth setuptools.pth pip-0.7.2-py2.6.egg txpostgres-0.3.0-py2.6.egg psycopg2 zope.interface-3.6.1-py2.6-macosx- 10.6-universal.egg psycopg2-2.2.2-py2.6.egg-info </code></pre> <p>However, importing psycopg2 at the different prompts imports two different versions. </p>
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    1. COThe prompt is identical because they both use the same build. My 2.6 virtualenv and non-virtual share the same timestamp as well.
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