title: Pycharm: Expected type 'Integral', got 'str' instead
body: <p>I just installed PyCharm 3.4 and get some new warnings. Not just here but in many places. Code is fine of course. Can someone translate what PyCharm trying to tell me and how to silence this messages? </p>
  
  <p><img src="https://i.imgur.com/Zkqz6T2.png" alt="screenshot">
  <a href="https://i.imgur.com/WNaEumT.png">more...</a></p>