Fix python3 on mac with multiple version

fix-python3-multiple-version-on-mac.md

Title

brew uninstall --ignore-dependencies python@3
cd /usr/local/Cellar/python/
rm -rf  /usr/local/bin/python3

cd /Library/Frameworks/Python.framework/Versions
rm -rf /Library/Frameworks/Python.framework/Versions

cd /usr/bin
rm -rf python3*
brew rm python 
$ rm -rf /usr/local/opt/python
$ brew cleanup 

// https://docs.python-guide.org/starting/install3/osx/
export PATH="/usr/local/opt/python/libexec/bin:$PATH"
brew install python

// restart Terminal

// uninstall pip3
sudo pip uninstall pip3
sudo pip uninstall pip

rm -rf /Library/Developer/CommandLineTools/usr/bin/pip3

// install pip and pip3

pip3 install --upgrade pip3 setuptools
python3 -m venv env
source ./env/bin/activate

brew cleanup
cd  /usr/local/lib/python3.8
sudo chown -R $(whoami) $(brew --prefix)/*
brew postinstall python

python3 get-pip.py

// Done