Enums have been proposed for inclusion into the language before, but were rejected (see http://www.python.org/dev/peps/pep-0354/), though there are existing packages you could use instead of writing your own implementation:
- enum: http://pypi.python.org/pypi/enum
- SymbolType (not quite the same as enums, but still useful): http://pypi.python.org/pypi/SymbolType
- Or just do a search
