Prevent self being passed to a function stored as a member variable?

Jean-Paul Calderone exarkun at divmod.com
Mon Sep 4 18:53:09 CEST 2006


On 4 Sep 2006 09:39:32 -0700, Sandra-24 <sandravandale at yahoo.com> wrote:
>How can you prevent self from being passed to a function stored as a
>member variable?

This doesn't happen:

>>> class x:
...     def __init__(self):
...             self.x = lambda: None
... 
>>> x().x()
>>> class y(object):
...     def __init__(self):
...             self.y = lambda: None
... 
>>> y().y()
>>> 

Perhaps you confused this case with the case of a function which is a
class attribute?

>>> z().z()
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: <lambda>() takes no arguments (1 given)
>>> 

In which case, staticmethod() is actually the solution you want:

>>> class w(object):
...     w = staticmethod(lambda: None)
... 
>>> w().w()
>>> 

Jean-Paul



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