scott <[EMAIL PROTECTED]> wrote:
>hi people,
>
>can someone tell me, how to use a class like that* (or "simulate" more
>than 1 constructor) :
>#--
>class myPointClass:
> def __init__(self, x=0, y=0):
> self.x = x
> self.y = y
> def __init__(self, x=0, y=0, z=0):
> self.__init__(self, x, y)
> self.z = z
Python does not have the kind of polymorphism that C++ or Java has.
There is only a single copy of each method (including __init__) for
each class, but methods can take variable numbers of arguments, with
default values. You probably want something like:
def __init__(self, x=0, y=0, z=0):
self.x = x
self.y = y
self.z = z
You can call this with 0, 1, or 2 arguments, i.e. any of the following
are legal:
MyClass() # x, y, and z all get defaulted to 0
MyClass(1) # x=1, y and z both default to 0
MyClass(1, 2) # x=1, y=2, z defaults to 0
MyClass(1, 2, 3) # x=1, y=2, z=3
Once you get the hang of it, you'll understand just how brain-dead C++
and Java really are :-)
Take a look at http://docs.python.org/ref/function.html for more
details.
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