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copied!<p>I am a complete Python/Virtualenv novice. However, I had the exact same problem and found a solution that worked for me. I believe that this will vary greatly depending upon the way you originally setup Python & Virtualenv.</p> <p>In my case, the Lion upgrade completely wiped out all contents of my <code>/Library/Python/2.*/site-packages</code>, but left the now broken executables (which link to the contents of this folder) in <code>/usr/local/bin</code>. I believe that this is the root cause of the cryptic "No module" import errors.</p> <p>Reviewing my .bash_history, I had originally used <code>easy_install</code> to install <code>pip</code>, and then <code>pip</code> to install <code>virtualenv</code> and <code>virtualenvwrapper</code>. Once I repeated these steps, then I was able to re-enter my old virtual environments which still contained all the packages I had installed on 10.6. Note, however, that 10.6 shipped with Python 2.6 as default. If your packages require Python 2.6, you should change your default Python version to 2.6 first.</p> <p>Step-by-step:</p> <ol> <li>I removed old Virtualenv configuration commands from my shell startup scripts (eg., <code>.bash_profile</code>). Start a new terminal session.</li> <li>(optional) Choose the version of Python you wish to use, eg.,<br> <code>defaults write com.apple.versioner.python Version 2.6</code></li> <li><code>sudo easy_install pip</code>. It seems as though <code>/Library/Python/2.*/site-packages</code> now requires administrator privileges. I don't recall that being the case in 10.6 (or at least my bash history doesn't reflect that).</li> <li><code>sudo pip install virtualenv</code></li> <li><code>sudo pip install virtualenvwrapper</code></li> <li>Finally, I re-enabled those virtualenv configuration commands I disabled in step 1. A new terminal session had everything back the way it was (look at <code>pip freeze -l</code> to see local packages in this virtual environment). I think.</li> </ol>

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