[Python-bugs-list] redefined class methods don't get passed a class instance (PR#212)
Fri, 25 Feb 2000 06:35:35 -0500 (EST)
> Here, I'm trying to redefine a method by assigning to it a new function
> definition. It has the same parameters as the original definition, but when it
> gets called after the assignment, I get "TypeError: not enough arguments;
> expected 1, got 0" Isn't the class instance supposed to be passed?
> class A:
> def g(self):
> print self.h()
> def h(self):
> return "hi"
> a1 = A()
> a1.h = lambda self : "bye"
You can't do it this way; if you assign a function directly to an
attribute of the instance it won't get self passed. You can assign a
function to the class (A.h = lambda...) and then it *will* get self
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