Fix broken Python virtualenv after an upgrade

It’s broken!

Python virtual environments are nice in many ways. However everytime I upgrade Python in Homebrew, I get something like this:

$ python
dyld: Library not loaded: @executable_path/../.Python
  Referenced from: /Users/serge/.virtualenvs/gensys/bin/python
  Reason: image not found
Trace/BPT trap: 5

Fortunately, it’s actually quite easy to fix!

Fixing virtualenv

  1. remove symbolic links
  2. re-create the virtual environment

In terms of commands:

$ cd myvirtualenv
$ find . -type l -print0 |xargs -0 rm -vf --   # Remove all symbolic links
$ virtualenv .   # Don't forget custom arguments, like "-ppython2.7"