On 7/25/11 1:43 PM, Michael Foord wrote:
Some apis (for example those exported directly from C) can't work with something that isn't a real int.
I think almost all of those will usually accept an object that implements __int__ and __index__, don't they? E.g. [~] |1> import os [~] |2> class A(object): ..> def __init__(self,x): ..> self.x = x ..> def __int__(self): ..> return self.x ..> def __index__(self): ..> return self.x ..> [~] |10> os.open('foo', A(os.O_RDWR)) 21 os.open() just uses PyArg_ParseTuple(), like most extension functions. I'm sure you could write an extension function that would reject A() instances, but it's more work, so most people don't. -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco