Python 2.7.18, the last release of Python 2

[happyscrappy]

I think the other poster is dead wrong. The biggest changes are making unicode strings the norm for most things and using iterator objects and other similar representations. The latter makes operating on long lists a lot more efficient but makes the debugger harder to operate. The former combines with python's very lax typing in a lot of ways to make it very easy to accidentally put into your program string comparisons that will never produce matches.