Six: Python 2 and 3 Compatibility Library� Six provides simple utilities for wrapping over differences between Python 2 and Python 3. It is intended to support codebases that work on both Python 2 and 3 without modification. six consists of only one Python file, so it is painless to copy into a project. Six can be downloaded on PyPi. Its bug tracker and code hosting is on BitBucket. The name, “six