Default method arguments

[Mike Meyer]

gregory.petrosyan at gmail.com writes:

> Hello everybody!
> I have little problem:
>
> class A:
>     def __init__(self, n):
>         self.data = n
>     def f(self, x = ????)
>         print x
>
> All I want is to make self.data the default argument for self.f(). (I
> want to use 'A' class as following :

Store your default value in a container, and test for it:

class A:
    _data = [None]
    def __init__(self, n):
        self._data = [n]
    def f(self, x = _data):
        if x is self._data:
           x = x[0]
        print x
          
There are lots of variations on this theme.

      <mike
-- 
Mike Meyer <mwm at mired.org>			http://www.mired.org/home/mwm/
Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information.