How can I make a class that can be converted into an int?
python.list at tim.thechases.com
Mon Oct 2 17:17:44 CEST 2006
> What are the internal methods that I need to define on any class so that
> this code can work?
> c = C("three")
> i = int(c) # i is 3
> I can handle the part of mapping "three" to 3, but I don't know what
> internal method is called when int(c) happens.
> For string conversion, I just define the __str__ method. What's the
> equivalent for int? For float, too, while I'm at it?
Is it too unkind to say it's semi-obvious?
>>> class Impersonator(object):
... def __str__(self): return "I'm a string"
... def __int__(self): return 42
... def __float__(self): return 3.14159
>>> c = Impersonator()
"I'm a string"
You say you can handle the conversion of "three" to 3, so I leave
that implementation of __int__(self) to you... :)
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