Functions associated with a class.

John Machin sjmachin at
Tue Jul 1 02:06:33 CEST 2008

On Jul 1, 9:44 am, Kurda Yon <kurda... at> wrote:
> Hi,
> I start to learn the object oriented programing in Python. As far as I
> understood, every class has a set of corresponding methods and
> variables. For me it is easy to understand a method as a one-argument
> function associated with a class. For example, if I call "x.calc" and
> "y.calc" and if "x" and "y" belongs to different classes I, actually,
> call to different function (the first one is associated with the first
> class and the second one with the second class). If "x" and "y"
> belongs to the same class, the "x.calc" and "y.calc" refer to the same
> function (but called with different arguments ("x" and "y",
> respectively)).
> In the above described case we have one-argument function. But what
> should we do if we one two have a two-argument function. For example,
> we want to have a method "calc" which take two objects and returns one
> value. How do we call this method? Like "x&y.calc"? Or just calc(x,y)?
> In the case of the one-argument functions Pythons automatically decide
> which function to call (associated with the first class or with the
> second class). Will it be the same in the case of the two-argument
> function.
> I am not sure that I am clear. If I am not clear, just ask me. I will
> try to reformulate my questions.
> Thank you.


where the calc method would (by convention) start

def calc(self, other):

See the very recent thread about "self and other" (or something like

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