How to install and use pyenv and pyenv virtualenv

gistfile1.txt

How to install and use pyenv and pyenv virtualenv
by @harmancode | https://github.com/harmancode | https://harman.page
This work is licensed under a Creative Commons Attribution 4.0 International License.

pyenv
https://github.com/pyenv/pyenv

1. Install:

$ brew update
$ brew install pyenv  

2. Shell configuration for Zsh:
echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.zshrc
echo 'command -v pyenv >/dev/null || export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.zshrc
echo 'eval "$(pyenv init -)"' >> ~/.zshrc

If you wish to get Pyenv in noninteractive login shells as well, also add the commands to ~/.zprofile or ~/.zlogin.

3. Restart shell

pyenv-virtualenv
https://github.com/pyenv/pyenv-virtualenv

Install
$ brew install pyenv-virtualenv

Shell configuration for Zsh
$ echo 'eval "$(pyenv virtualenv-init -)"' >> ~/.zshrc

Restart shell
Bash:
$ exec bash -l

For zsh,
$ exec zsh -l

Install python version to pyenv

Check installed versions
$ pyenv versions

If you wanted to see all the available Python 3.6 through 3.8, you can do this:
$ pyenv install --list | grep " 3\.[678]"

All versions:
$ pyenv install --list

Install specific version:
$ pyenv install -v 3.7.2

Create and activate virtual environment
https://realpython.com/intro-to-pyenv/#virtual-environments-and-pyenv

General command to create virtual environment
$ pyenv virtualenv <python_version> <environment_name>

With specific version
$ pyenv virtualenv 3.6.8 myproject

Create virtualenv from current version
$ pyenv virtualenv myproject

Generates .python-version file in the directory
$ pyenv local myproject

To be sure:
$ pyenv which python
$ pyenv which pip

Activate/deactivate manually
$ pyenv activate <environment_name>
$ pyenv deactivate

Activate/deactivate automatically
1. Create .python-version file in the project dir with: pyenv local myproject
2. Make sure that you made Shell configuration for Zsh as explained above.
3. Deactivate the environment if activated
4. Leave the directory if entered
5. Enter the directory

Remove a virtualenv

$ pyenv uninstall <environment_name>