title: Python PEP 8 docstring line length
body: <p>I've recently begun figuring it would be a good idea to follow PEP 8. I made my editor display the 80-column mark and am now attempting to wrap lines to fit in it. My question is this. In PEP 8 it says:</p>
  
  <blockquote>
    <p>Limit all lines to a maximum of 79 characters.</p>
  </blockquote>
  
  <p>Makes sense.</p>
  
  <blockquote>
    <p>[...] For flowing long blocks of text (docstrings or comments), limiting the length to 72 characters is recommended.</p>
  </blockquote>
  
  <p>Why 72? Why isn't 79 fine for docstrings or comments?</p>