Relink virtualenv python after upgrading Homebrew python

The link is sharp with brew cleanup

app: source venv/bin/activate
[venv] app: python
dyld: Library not loaded: @executable_path/../.Python
  Referenced from: /path/to/app/venv/bin/python
  Reason: image not found

Python 3.x series

** If you are using the venv directory inside the application directory **

find ./.venv -type l -delete && python3 -m venv ./.venv

• For .venv, specify the virtual environment directory as appropriate.

Python 2.x series

** If you are using virtualenv **

Relink of the guy who became like. All you have to do is unlink the ʻenvdirectory and relink with thevirtualenv` command.

find ./venv -type l -delete && virtualenv ./venv

It's annoying to relink one by one. You can update all at once by using virtualenvwrapper as follows

workon | xargs -L 1 -t -P 4 -I % -- sh -c 'find $WORKON_HOME/% -type l -delete && virtualenv $WORKON_HOME/%'

• It is faster to increase the number of -P 4s to the number of virtualenvs that are created and process them in parallel.