Custom shell functions for invoking pip3 with python36 and pip with python27 for installation and packages listing

globalpips.bash

#!/usr/bin/env bash

# Note: only tested on macOS; asssumes appropriate pips installed
# Disclaimer: use at your own peril
# Parting words: have a nice day

shopt -s expand_aliases

# edit this accordingly
pyverz=(
    "2.7"
    "3.4"
    "3.6"
)

for py in "${pyverz[@]}"
do
    command -v "python${py}" > /dev/null
    if [[ $? -eq 0 ]]; then
        pyvar="python${py} -m pip --isolated"
        alias py="${pyvar}"

        source <(cat << EOF
function gpip${py//./} ()
{
        if [[ "\$*" =~ "list" ]]
        then
            py "\$@" --format=columns
        elif [[ "\$*" =~ "install" ]]
        then
            sudo -H ${pyvar} "\$@"
        elif [[ "\$*" =~ "upgrade" ]]
        then
            py freeze | grep -v '^\-e' | cut -d = -f 1 | xargs -n1 sudo -H ${pyvar} install -U
        else
            echo "Unsupported option."
        fi
}
EOF
                )
    fi
done