Writing cross-compatible python2/python3 code in pycharm : <p>I've taken care to make sure library works on both python2 and python3, but pycharm adds some vexatious red squiggles as seen below </p>

<p><a href="https://i.stack.imgur.com/EBCpC.png" rel="noreferrer"><img src="https://i.stack.imgur.com/EBCpC.png" alt="enter image description here"></a></p>

<p>If I switch the project interpreter to python 3.5 instead, the nag just moves onto the other import.  <strong>Which inspection is this?  I want to turn it off.</strong>  </p>
