title: Python `no module pip.__main__;` error when trying to install a module
body: <p>I am getting the following error on my Raspberry Pi: <code>No module named pip__main__; 'pip' is a package and cannot be directly executed</code></p>
  
  <p>When I type in to the terminal: <code>sudo python3 -m pip install mp3play</code></p>
  
  <p>What is causing this and how can I fix it so that I can install the module <code>mp3play</code>?</p>