pyvenv was the recommended tool for creating virtual environments for Python 3.3 and 3.4, and is deprecated in Python 3.6.

The use of venv is now recommended for creating virtual environments.

https://levelup.gitconnected.com/how-to-set-up-python-environment-on-your-mac-560ebf9324ed

brew install pyenv

echo 'eval "$(pyenv init -)"' >> ~/.bash_profile

pyenv install 3.8.5

pyenv versions

pyenv global 3.8.5

pyenv local 3.8.5

pyenv shell 3.8.5

pyenv which pip

which python => pyenv shim

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brew install pyenv-virtualenv

pyenv virtualenv dev

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Library: https://github.com/pyenv/pyenv/wiki/Common-build-problems