title: Why does PyCharm propose to change method to static?
body: <p>The new pycharm release (3.1.3 community edition) proposes to convert the methods that don't work with the current object's state to static.</p>
  
  <p><img src="https://i.stack.imgur.com/l0TgW.png" alt="enter image description here"></p>
  
  <p>What is the practical reason for that? Some kind of micro-performance(-or-memory)-optimization?</p>