benhoyt wrote:
> 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?
Use globals():
def is_true_subclass(a, b):
try:
return issubclass(a, b) and a is not b
except TypeError:
return False
nmap = dict((m.number, m) for m in globals().itervalues()
if is_true_subclass(m, Message))
print nmap
You may also rely on duck-typing, assuming that everything that has a number
attribute is a Message subclass:
nmap = dict((m.number, m) for m in globals().itervalues()
if hasattr(m, "number"))
Peter
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