Passing a method indirectly
steve at holdenweb.com
Sun Mar 5 07:55:39 CET 2006
> I'm trying to write a function that takes an arbitrary object and
> The function applies the method to the object (and some other stuff).
> I get error "Test instance has no attribute 'method' "
> How can I make this work?
> def ObjApply (object,method):
> object.method ()
> class Test:
> def test1 (self): print "Hello"
> def test2 (self):
> ObjApply (self,self.test1)
> ta = Test ()
> ta.test2 ()
Your code appears to be based on a slight misunderstanding of method
calls. In your Test class you are calling ObjApply with two arguments,
the second of which is a "bound method" (in other words, it already
implicitly references the instance of which it is a method).
In still other words, there is really no need for two arguments to
ObjApply! Perhaps you need to think through your goals more clearly ...
>>> def ObjApply(method):
>>> class Test:
... def test1(self): print "Hello from", self
... def test2(self): ObjApply(self.test1)
>>> ts = Test()
Hello from <__main__.Test instance at 0x18cd238c>
So, what is it you *really* want to do?
Steve Holden +44 150 684 7255 +1 800 494 3119
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