title: Any check to see if the code written is in python 2.7 or 3 and above?
body: <p>I have a buggy long python project that I am trying to debug. Its messy and undocumented. I am familiar with python2.7. There are no binaries in this project. The straight forward idea is to try execute it as <code>python2.7 file.py</code> or <code>python3 file.py</code> and see which works. But as I said it is already buggy at a lot of places. So none of them is working. Is there any check or method or editor that could tell me if the code was written in python2.7  or python3?</p>