title: How to make python module executable?
body: <p>When using pip, we can download and use python module. </p>
  
  <p>One of them is like python file, like "pip install validators" and then we can import validators.</p>
  
  <p>One of them is like executable. like "pip install pyinstaller" and "pyinstaller 
  something.py".</p>
  
  <p>I am now writing a python module XYZ. How to make my module executable after "pip install XYZ" just like XYZ?</p>