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comp.lang.python

Re: Get a method instance through 'getattr' but not superclass's method

Steve Holden

3/11/2010 12:42:00 PM

Radhakrishna Bhat wrote:
> I am using getattr to get a method instance from a class. But it also
> returns methods from the superclass. How to detect if an attribute is
> from superclass?
>
You could try, if x is in instance, looking to see whether the name is
defined in x.__class__.__dict__.

>>> class A:
.... def method1(self):
.... print "A1"
.... def method2(self):
.... print "A2"
....
>>> class B(A):
.... def method2(self):
.... print"B2"
.... def method3(self):
.... print "B3"
....
>>> a = A()
>>> b = B()
>>> b.method2()
B2
>>> b.method1()
A1
>>> b.method3()
B3
>>> b.__class__.__dict__
{'__module__': '__main__', 'method2': <function method2 at 0x7ff1d6bc>,
'method3': <function method3 at 0x7ff1d3ac>, '__doc__': None}
>>> a.__class__.__dict__
{'__module__': '__main__', 'method2': <function method2 at 0x7ff1d064>,
'__doc__': None, 'method1': <function method1 at 0x7ff1d6f4>}
>>>

I'd be interested to know why this is so important.

regards
Steve
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