pipx在隔离环境中安装并且运行Python应用

$ brew install pipx
$ pipx ensurepath
$ vim ~/.bash_profile
export PATH=/Users/hina/.local/bin:$PATH
$ source ~/.bash_profile
$ pipx ensurepath

$ pipx install pycowsay
$ pipx install --python python3.6 pycowsay
$ pipx list
$ pycowsay hi
  --
< hi >
  --
   \   ^__^
    \  (oo)\_______
       (__)\       )\/\
           ||----w |
           ||     ||