> 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
While I'm not sure if this is the best/most-pythonic way to do
it, but it did it for me:
#############################################################
class A(object):
def list_cmds(self):
root_cmds = set(dir(A))
child_cmds = set(dir(self))
return list(child_cmds - root_cmds)
def __init__(self):
pass
class B(A):
def cmd1(self, args):
pass
def cmd2(self, args):
pass
b = B()
print repr(b.list_cmds())
#############################################################
If you have multiple inheritance going on, and you only want the
methods that the child adds, you might try something like
#############################################################
class A(object):
def list_cmds(self):
parent_cmds = set()
for base in self.__class__.__bases__:
parent_cmds.update(dir(base))
child_cmds = set(dir(self))
return list(child_cmds - parent_cmds)
def __init__(self):
pass
class C(object):
def foo1(self, args): pass
def foo2(self, args): pass
class B(A, C):
def cmd1(self, args):
pass
def cmd2(self, args):
pass
b = B()
print repr(b.list_cmds())
#############################################################
Just a few ideas,
-tkc
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