Is there a way to get __thismodule__?

[benhoyt]

Is there a way to get __thismodule__ in Python? That is, the current
module you're in. Or isn't that known until the end of the module?

For instance, if I'm writing a module of message types/classes, like
so:

class SetupMessage(Message):
    number = 1

class ResetMessage(Message):
    number = 2

class OtherMessage(Message):
    number = 255

nmap = {  # maps message numbers to message classes
    1: SetupMessage,
    2: ResetMessage,
    255: OtherMessage,
}

Or something similar. But adding each message class manually to the
dict at the end feels like repeating myself, and is error-prone. It'd
be nice if I could just create the dict automatically, something like
so:

nmap = {}
for name in dir(__thismodule__):
    attr = getattr(__thismodule__, name)
    if isinstance(attr, Message):
        nmap[attr.number] = attr

Or something similar. Any ideas?

(A friend suggested class decorators, which is a good idea, except
that they're not here until Python 2.6 or Python 3000.)

Cheers,
Ben.