identifying new not inherited methods

[Chaz Ginger]

Steve Holden wrote:
> malkarouri at gmail.com wrote:
>> Hi,
>>
>> I am writing a library in which I need to find the names of methods
>> which are implemented in a class, rather than inherited from another
>> class. To explain more, and to find if there is another way of doing
>> it, here is what I want to do: I am defining two classes, say A and B,
>> as:
>>
>> class A(object):
>>     def list_cmds(self):
>>         'implementation needed'
>>         ?
>>     def __init__(self):
>>     ... (rest of class)
>>
>> class B(A):
>>     def cmd1(self, args):
>>         pass
>>     def cmd2(self, args):
>>         pass
>>
>> I need an implementation of list_cmds in A above so that I can get a
>> result:
>>
>>
>>>>> b=B()
>>>>> b.list_cmds()
>>
>> ['cmd1','cmd2']                    #order not important
>>
>> I will be happy if anybody can point to me any way of doing it, using
>> class attributes, metaclasses or otherwise. What I don't want to do is
>> modifying class B, which contains just the cmds, if possible.
>>
>> Many thanks in advance.
>>
> $ cat test01.py
> class A(object):
>     def list_cmds(self):
>         """return callable attributes from
>            subclasses not present in main class."""
>         Amethods = [m for m in dir(A) if callable(getattr(A, m))]
>         return [m for m in dir(self.__class__)
>                 if callable(getattr(self.__class__, m))
>                    and m not in Amethods]
>     def __init__(self):
>         pass
> 
> class B(A):
>     def cmd1(self, args):
>         pass
>     def cmd2(self, args):
>         pass
> 
> print "A additionals:", A().list_cmds()
> print "B additionals:", B().list_cmds()
> 
> 
> sholden at bigboy ~
> $ python test01.py
> A additionals: []
> B additionals: ['cmd1', 'cmd2']
> 
> sholden at bigboy ~
> $
> 
> Hope this helps.
> 
> regards
>  Steve

You don't really want to use dir(A), since this will not pick up all the 
  classes that make up A.  Don't you want to use the MRO instead?

Chaz