brew install python@2

$ brew install python

# Download/run the legacy macOS installer (pick which one for your sys)
https://www.python.org/downloads/release/python-2716/

# Add pip for python2.7
curl https://bootstrap.pypa.io/pip/2.7/get-pip.py -o get-pip2.py
python2 get-pip2.py

# Optionally check for pip updates (in case of post-eol patches)
python2 -m pip install --upgrade pip

# Optionally add the helpers like easy_install back onto your path
# In your ~/.zprofile or whatever bash/shell profile equivalent
PATH="/Library/Frameworks/Python.framework/Versions/2.7/bin:${PATH}"
export PATH

# Optionally add some helpers while editing shell profile
alias pip2="python2 -m pip"
alias venv2="virtualenv -p python2"
alias venv3="virtualenv -p python3"

# Optionally some apple-specific std libraries are missing, search
# and download them. Example: plistlib.py
curl https://raw.githubusercontent.com/python/cpython/2.7/Lib/plistlib.py -o /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plistlib.py

# Lastly, there is no symlink /usr/bin/python anymore
# /usr/bin is system protected so you can't add one either
# 
# Change your programs to use /usr/local/bin/python
# or google how to disable macOS SIP to make a symlink in /usr/bin

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