## Install Homebrew on Mac

`/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"`

## Install pyenv to Manage Your Python Versions

`brew install pyenv`

## Use pyenv to Install Python or Update Your Python Version

`pyenv install 3.9.2`

## Set Up Your MacOS PATH for pyenv (Bash or ZSH)

#### For Bash

```
echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bash_profile
echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bash_profile
echo -e 'if command -v pyenv 1>/dev/null 2>&1; then\n  eval "$(pyenv init --path)"\nfi' >> ~/.bash_profile
source  ~/.bash_profile
```

OR add the Open your ~/.bash_profile then add the commands below at the bottom
```
export PYENV_ROOT="$HOME/.pyenv"
export PATH="$PYENV_ROOT/bin:$PATH"
eval "$(pyenv init --path)"
eval "$(pyenv init -)"
```


#### For ZSH

```
echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.zshrc
echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.zshrc
echo -e 'if command -v pyenv 1>/dev/null 2>&1; then\n  eval "$(pyenv init --path)"\nfi' >> ~/.zshrc
source ~/.zshrc
```

## Troubleshooting:

Some guides will use `eval "$(pyenv init -)"` instead of `eval "$(pyenv init --path)"`

In my case `eval "$(pyenv init --path)"` worked

System:

- MacOS Majove v10.14.6
- Homebrew 3.2.5
- pyenv 2.0.4


## How to remove Pyenv from mac
https://github.com/pyenv/pyenv#uninstalling-pyenv

The simplicity of pyenv makes it easy to temporarily disable it, or
uninstall from the system.

1. To **disable** Pyenv managing your Python versions, simply remove the
  `pyenv init` invocations from your shell startup configuration. This will
  remove Pyenv shims directory from `PATH`, and future invocations like
  `python` will execute the system Python version, as it was before Pyenv.

    `pyenv` will still be accessible on the command line, but your Python
    apps won't be affected by version switching.

2. To completely **uninstall** Pyenv, remove _all_ Pyenv configuration lines
  from your shell startup configuration, and then remove
  its root directory. This will **delete all Python versions** that were
  installed under the `` $(pyenv root)/versions/ `` directory:

    ```sh
    rm -rf $(pyenv root)
    ```

    If you've installed Pyenv using a package manager, as a final step,
    perform the Pyenv package removal. For instance, for Homebrew:

    ```
    brew uninstall pyenv
    ```


## Sources:

https://www.freecodecamp.org/news/python-version-on-mac-update/

https://github.com/pyenv/pyenv/issues/849