Python Virtual Environment

There is more than one way to skin the cat:

• venv, makefile
• virtulaenv
• pyenv with pyenv-virtualenv - see How pyenv decides on a python version.

Here we cover pyenv+pyenv-virtualenv on Mac and Linux.

Install pyenv+pyenv-virtualenv on MacOS

Install pyenv:

brew update
brew install pyenv
echo 'eval "$(pyenv init --path)"' >> ~/.zprofile
echo 'eval "$(pyenv init -)"' >> ~/.zshrc

Install pyenv-virtualenv:

brew install pyenv-virtualenv
echo 'eval eval "$(pyenv virtualenv-init -)"' >> ~/.zshrc

Install pyenv+pyenv-virtualenv on Linux

curl https://pyenv.run | bash

added this to .zshenv:

# support for pyenv
export PYENV_ROOT="$HOME/.pyenv"
[[ -d $PYENV_ROOT/bin ]] && export PATH="$PYENV_ROOT/bin:$PATH"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"

Create a Virtual Environment

• create .python-version;
• pyenv uses python version from .python-version;
• pyenv-virtualenv creates and uses python virtual environment named after .python-version.

Virtual Environment Maintenance

To see the current dependencies as a table:

pip3 list

To freeze:

pip3 freeze > requirements.txt