How to determine which method was used in an inheritance heirarchy?

[Erik Jones]

On Jul 16, 2007, at 12:53 AM, Michele Simionato wrote:

> On Jul 16, 7:18 am, Erik Jones <e... at myemma.com> wrote:
>> On Jul 15, 2007, at 11:23 PM, Michele Simionato wrote:
>>
>>> On Jul 16, 5:51 am, Erik Jones <e... at myemma.com> wrote:
>>>> Say you're given a call event frame for a method call.  How can you
>>>> tell if the code being executed came from a super class of the  
>>>> object
>>>> or class the method was called on?
>>
>>>> Erik Jones
>>
>>> You look if the method was defined in self.__class__.__dict__.
>>
>>>        Michele Simionato
>>
>> That doesn't seem to cover calling super class __init__ methods.
>>
>
> I am probably missing something. In the following code the
> method check_init checks if the current instance
> possess an __init__ or if it just inherits one
> from the ancestors. Is this what you want?
>
> class B(object):
>     def __init__(self):
>     	'something'
>     def check_init(self):
>         if '__init__' in self.__class__.__dict__:
>             print 'possesses __init__'
>         else:
>             print 'inherits __init__'
>
> class C(B):
>     'something else'
>     def __init__(self):
>         print 'calling C.__init__'
>
> class D(B):
>     pass
>
> c = C()
> d = D()
>
> c.check_init() #possesses __init__
> d.check_init() #inherits __init__

Ok, I see how I was pretty vague with my original questions.   Given  
the pattern where you need to call a base class's constructor (or,  
other overriden method of the same name as that being called on the  
child class object):

class A(object):
	def __init__(self):
		print self.__class__.__name__

class B(A):
	def __init__(self):
		A.__init__(self)
		print self.__class__.__name__

B()

This will output:

B
B

How can I get

A
B

Erik Jones

Software Developer | Emma®
erik at myemma.com
800.595.4401 or 615.292.5888
615.292.0777 (fax)

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