Find and list most installed Python versions on a macOS system

pythonlister.sh

#!/bin/bash
set -o errexit
# pythonlister version 0.3
# License: MIT - (c) 2020 ChrisWayg

# Run the script directly
# /bin/bash -c "$(curl -fsSL https://gist.githubusercontent.com/chriswayg/ee97606a4dc93a4cdacff90915d5d1e5/raw/pythonlister.sh)"

# Download, install with sudo in /usr/local/ and run the script
# f=/usr/local/bin/pythonlister; sudo mkdir -p /usr/local/bin && sudo curl -sSLo $f https://gist.githubusercontent.com/chriswayg/ee97606a4dc93a4cdacff90915d5d1e5/raw/pythonlister.sh && sudo chmod +x $f && pythonlister

# make sure you understand the script, before you install it with sudo.

color="$(tput bold; tput setaf 5)"
reset="$(tput sgr0)"
#clear
printf "==============  LIST INSTALLED PYTHON VERSIONS ON THE SYSTEM  ===============\n"
#printf "The script will display 'python --version' for the Python executables\n"
#printf "found in the file-system and in the PATH\n"

# Python.org - https://www.python.org/downloads/
# Miniconda https://docs.conda.io/en/latest/miniconda.html
# Homebrew & Pyenv https://brew.sh/
# Pyenv https://github.com/pyenv/pyenv
# MacPorts https://ports.macports.org/

findPython=("2.3" "2.4" "2.5" "2.6" "2.7" "3.4" "3.5" "3.6" "3.7" "3.8" "3.9" "3.10" "3.11" "3.12")
#printf "\n*** Searching for Python " && echo ${findPython[@]}

checkPaths=("/System/Library/Frameworks/Python.framework/Versions" \
            "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions" \
            "/Library/Frameworks/Python.framework/Versions" \
            "$HOME/Library/Frameworks/Python.framework/Versions" \
            "/usr/local/Cellar/python*/*/Frameworks/Python.framework/Versions" \
            "/Users/$(id -un)/.pyenv/versions")

#echo "Check paths: ${checkPaths[@]}"

# the array expansion is not double-quoted to allow filename expansion
for searchPath in ${checkPaths[@]}; do

    case $searchPath in
        /System/Library/Frameworks/Python.framework/*)
          installedBy="macOS in System"
          ;;
        /Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/*)
          installedBy="Xcode CLT in Library"
          ;;
        */Library/Frameworks/Python.framework/*)
          installedBy="Python.org in Library"
          ;;
        /usr/local/Cellar/*)
          installedBy="Homebrew in cellar"
          ;;
        /Users/*/.pyenv/*)
          installedBy="Pyenv for user"
          ;;
        *)
          installedBy="Unknown"
          ;;
    esac

  	[[ -d $searchPath/ ]] && printf "${color}*** Installed by $installedBy: ${reset}" && ls $searchPath/
  	if [[ -d $searchPath/ ]]; then
        #echo "- search path $searchPath"
    		for ver in "${findPython[@]}"; do
      		  #echo "- looking for python${ver}"
      			path_of_python=$searchPath/${ver}*/bin/python${ver}
      			if command -v $path_of_python &> /dev/null; then
      				    printf "==> $path_of_python - " && $path_of_python -V 2>&1 | head -n 4
      			fi
    		done
  	fi
done

checkPaths=("/opt/local/bin" \
            "/Users/$(id -un)/.pyenv/shims" \
            "/Users/$(id -un)/miniconda*/bin" \
            "/Users/$(id -un)/anaconda*/bin")

# the array expansion is not double-quoted to allow filename expansion
for searchPath in ${checkPaths[@]}; do

    case $searchPath in
        /opt/local/*)
          installedBy="Macports in opt"
          ;;
        /Users/*/.pyenv/*)
          installedBy="Pyenv in shims"
          ;;
        /Users/*/miniconda*)
          installedBy="Miniconda for user"
          ;;
        /Users/*/anaconda*)
          installedBy="Anaconda for user"
          ;;
        *)
          installedBy="Unknown"
          ;;
    esac

    [[ -d $searchPath/ ]] && printf "${color}*** Installed by $installedBy: ${reset}\n"
  	if [[ -d $searchPath/ ]]; then
        #echo "- search path $searchPath"
    		for ver in "${findPython[@]}"; do
    			  path_of_python=$searchPath/python${ver}
    		    #echo "- looking in $path_of_python"
      			if command -v $path_of_python &> /dev/null; then
      				printf "${color}==> $path_of_python - ${reset}" && $path_of_python -V 2>&1 | head -n 4
      			fi
    		done
  	fi
done
printf "\n==============  Listing currently activated Python versions   ===============\n"
findPython=("Python" "2" "2.3" "2.4" "2.5" "2.6" "2.7" "3" "3.4" "3.5" "3.6" "3.7" "3.8" "3.9" "3.10" "3.11" "3.12")
#printf "\n*** Searching for versions of " && echo ${findPython[@]}

printf "${color}*** In PATH:${reset} $PATH\n"

for ver in "${findPython[@]}"; do
    [[ $ver == "Python" ]] && ver=""
    pythonver="python${ver}"
    #echo "- looking for $pythonver"
    if command -v $pythonver &> /dev/null; then
        printf "${color}The command '$pythonver' will run ${reset}" && which $pythonver
        printf "==> Version: " && $pythonver -V 2>&1 | head -n 4
	  fi
done

if command -v pip -V &> /dev/null; then
    printf "${color}The command 'pip' will run ${reset}" && which pip
    printf "==> Version: " && pip -V 2>&1 | head -n 4
fi

if command -v pip3 -V &> /dev/null; then
    printf "${color}The command 'pip3' will run ${reset}" && which pip3
    printf "==> Version: " && pip3 -V 2>&1 | head -n 4
fi

if command -v pipenv --version &> /dev/null; then
    printf "${color}The command 'pipenv' will run ${reset}" && which pipenv
    printf "==> Version: " && pipenv --version 2>&1 | head -n 4
fi

printf "\n"

[[ ! -z $VIRTUAL_ENV ]] || [[ ! -z $CONDA_DEFAULT_ENV ]] && printf "${color}==> NOTE:${reset} you are running in a virtual environment! \n\n"