Adding methods from one class to another, dynamically

Gerald Britton gerald.britton at gmail.com
Mon Feb 1 21:50:36 CET 2010


Or you could just do a mixin:

tee.__class__.__bases__ = (test,) +  tee.__class__.__bases__


On Mon, Feb 1, 2010 at 3:25 PM, Chris Rebert <clp2 at rebertia.com> wrote:
> On Mon, Feb 1, 2010 at 12:06 PM, Oltmans <rolf.oltmans at gmail.com> wrote:
>> Hello Python gurus,
>>
>> I'm quite new when it comes to Python so I will appreciate any help.
>> Here is what I'm trying to do. I've two classes like below
>>
>> import new
>> import unittest
>>
>> class test(unittest.TestCase):
>>    def test_first(self):
>>        print 'first test'
>>    def test_second(self):
>>        print 'second test'
>>    def test_third(self):
>>        print 'third test'
>>
>> class tee(unittest.TestCase):
>>    pass
>>
>> and I want to attach all test methods of 'test'(i.e. test_first(),
>> test_second() and test_third()) class to 'tee' class. So I'm trying to
>> do something like
>>
>> if __name__=="__main__":
>>    for name,func in inspect.getmembers(test,inspect.ismethod):
>>        if name.find('test_')!= -1:
>>            tee.name = new.instancemethod(func,None,tee)
>
> This ends up repeatedly assigning to the attribute "name" of tee; if
> you check dir(tee), you'll see the string "name" as an entry. It does
> *not* assign to the attribute named by the string in the variable
> `name`.
> You want setattr(): http://docs.python.org/library/functions.html#setattr
> Assuming the rest of your code chunk is correct:
>
> setattr(tee, name, new.instancemethod(func,None,tee))
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Gerald Britton



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