PY_VERSIONS="2,2.7,3,"
PY_VERSIONS+="$(eval echo 3.{`seq -s, 4 12`} | sed 's/ /,/g')"

eval delegate_completion python python{$PY_VERSIONS}

_pip_completion_loader() {
    if [ "`type -t _pip_completion`" != function ]; then
        eval "`pip3 completion --bash`"
    fi
    eval complete -F _pip_completion pip pip{$PY_VERSIONS}
    unset _pip_completion_loader PY_VERSIONS
    return 124
}
eval complete -F _pip_completion_loader pip pip{$PY_VERSIONS}