Hey @debugger22 this is the work of [`autopep8`](https://pypi.python.org/pypi/autopep8/‎) tool. It seems by pep8 standards it is a good practice to use `is` for `None` rather than equality operators. Check this link: [Programming Recommendations - PEP8 standards](http://legacy.python.org/dev/peps/pep-0008/#programming-recommendations) :)