CODEWITHSUNDEEP
pythonclass
thkang
thkang

Reputation: 11543

How do I access superclass's classmethod?

I really need to find some way to superclass's classmethod from subclasses of that superclass.

here is the generalized code:

class A(object):
    def __init__(self):
        print "A init"

    @classmethod
    def _method(cls):
        print cls
        return cls()


class B(A):
    def __init__(self):
        print "B init"

class C(B):
    def __init__(self):
        print "C init"

    @classmethod
    def _method(cls):
        print "calling super(C)'s classmethod"
        return super(C)._method()

c = C._method()

which results in :

Traceback (most recent call last):
  File "C:/Python27x64/testclass", line 26, in <module>
    c = C._method()
  File "C:/Python27x64/testclass", line 22, in _method
    return super(C)._method()
AttributeError: 'super' object has no attribute '_method'

note that from c = C._method(), I am calling uninitialized class C's classmethod. and from C, I call also uninitialized class A or B (traversing through the MRO)'s classmethod.

How can I achieve this?

Upvotes: 2

Views: 278

Answers (1)

TyrantWave
TyrantWave

Reputation: 4673

You need to include the cls variable in the super call:

class C(B):
    def __init__(self):
        print "C init"

    @classmethod
    def _method(cls):
        print "calling super(C)'s classmethod"
        return super(C, cls)._method()

Upvotes: 1

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