title: Comment some lines in a text file using python
body: <p>I'm new to python and I just started learning the basics.</p>
  
  <p>I'm trying to create a program that will take a file and comment (using # ) the lines that don't have anything after the equal sign.</p>
  
  <p>For example,</p>
  
  <blockquote>
    <p><strong>V12 =</strong> </p>
    
    <p><strong>V13 = 3</strong></p>
  </blockquote>
  
  <p>Should be</p>
  
  <blockquote>
    <p><strong>#V12 =</strong> </p>
    
    <p><strong>V13 = 3</strong></p>
  </blockquote>
  
  <p>Thank you in advance for your help.</p>