Mr.SpOOn <[EMAIL PROTECTED]> wrote:
> Now I must pass a and b to the main constructor and calculate them in
> the classmethods.
>
> class foo:
> def __init__(self, a, b):
> self.a = a
> self.b = b
>
> @classmethod
> def from_string(self, ..):
> ...
> ...
>
> What I mean is: I can't use anymore __init__ as the default
> constructor, but I always have to specify the way I'm creating my
> object. Am I right? I'm asking just to be sure I have understood.
There is a really big advantage to being explicit in this situation: you no
longer have to make sure that all your constructors use a unique set of
types. Consider:
class Location(object):
def __init__(self, lat, long): ...
@classmethod
def from_city(name): ...
@classmethod
def from_postcode(name): ...
'from_string' is a bad name here for your factory method: you should try to
make it clear what sort of string is expected.
--
Duncan Booth http://kupuguy.blogspot.com
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