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python-3.xvirtualenvpyenv

How to re-build python without removing the packages installed

I use pyenv to manage my python versions as well as their virtual environments. Sometimes I ran into problems, of which the solution requires building python after installing certain dependencies.

So I simply run

pyenv uninstall 3.8.12

and install the dependencies required, then

pyenv install 3.8.12

however, this operation removes all the package installed along with the entire virtual environment under

pyenvrootdir/.pyenv/versions/3.8.12

in the previous version, like numpy or matplotlib.

So is there any way to remove, then re-build python, while those packages remains, so that I don't need to install them again?

Solution

  • Use virtualenv with pyenv: https://github.com/pyenv/pyenv-virtualenv

    Then you can just write, uninstall only needed if you like to delete it:

    pyenv install 3.11.2
pyenv virtualenv 3.11.2 test1
pyenv activate test1
pyenv uninstall test1

    To install a new one, just deactivate the current:

    pyenv deactivate
pyenv virtialenv 3.11.2 mynewapp
pyenv activate mynewapp

    It is not uncommon having lots of virtualenvs.