title: how to fix the "W293 blank line contains whitespace"
body: <p>my python code produce the following warning message:</p>
  
  <pre><code>(1) \dir\file.py:8:1 W293 blank lines contains whitespace
  this comes after commands[0] flake8 XXX
  </code></pre>
  
  <p>how do you fix the issue?</p>