Future-compatible enums in 2.7?

Question

Many methods of implementing enums are shown in the answers to this question. However, PEP0435 is out now and describes how Enum and IntEnum will become official in Python 3

Answer 1

There is a backport of the PEP 435 enum module available on PyPI as enum34. The backport seems to be unofficial, however it is authored by Ethan Furman, who is a Python core committer and one of the co-authors of PEP 435.

The backport is declared compatible with Python 2.4 and greater. Of course, under Python 2 there are a few, relatively minor, differences in behaviour, but from my preliminary exploration under Pyhon 2.7, I'd say that the level of forward compatibility is quite high.