For the last few years, I have been using Ansible to configure my Macbook Pro. One of the things that my playbook does when it is run is update my homebrew installed applications. While this helps to ensure that I’m running the latest version of the apps that I install, it occasionally causes some issues with my Python virtualenvs. After an upgrade I may see something like this:


( fp-mbp: ~)
% workon my-venv
(my-venv) ( fp-mbp: ~)
% python --version
dyld: Library not loaded: /usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/Python
  Referenced from: /Users/mark.honomichl/.virtualenvs/my-venv/bin/python
  Reason: image not found
zsh: abort      python --version
(my-venv) ( fp-mbp: ~)
%

In this case, my virtualenv was created with python 3.7.4 and homebrew has updated my python to 3.7.6. Thankfully, the fix is rather easy. First step is to delete the stale links in your virtualenv.


deactivate my-venv
cd ~/.virtualenvs/my-venv
find . -type l -delete

Once you’ve removed the links, you can re-run the virtualenv wrapper command to recreate the symlinks.


mkvirtualenv my-venv

With that, you virtual environment will be working again:


(my-venv) ( fp-mbp: ~/.virtualenvs/acg)
% python --version
Python 3.7.6
(my-venv) ( fp-mbp: ~/.virtualenvs/acg)
%