title: How to run an installed python package from terminal
body: <p>I have a python code like so</p>
  
  <pre><code>wallpaper/
     setup.py
     wallpaper/
        __init__.py
        environments.py
        run.py
  </code></pre>
  
  <p>The run.py has a function like so:</p>
  
  <pre><code>import environments
  
  def main():
     .. do something()
  if __name__=='__main__':
     main()
  </code></pre>
  
  <p>After installing this package how do I execute the run.py script on my terminal. I realize this question has been asked before but I wasn't satisfied with that answer as it did not offer me any insight.</p>