how to refer to a parent method in python?

This question already has an answer here:

Call a parent class's method from child class in Python? 12 answers

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If you know you want to use A you can also explicitly refer to A in this way:

class B(A):
    def f(self,num): 
        return 7 * A.f(self,num)

remember you have to explicitly give the self argument to the member function Af()

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Use super :

return 7 * super(B, self).f(num)

Or in python 3, it's just:

return 7 * super().f(num)

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In line with the other answers, there are multiple ways to call super class methods (including the constructor), however in Python-3.x the process has been simplified:

Python-2.x

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

class B(A):
 def __init__(self):
   print "hello"
   super(B, self).__init__()

Python-3.x

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

class B(A):
 def __init__(self):
   print "hello"
   super().__init__()

super() is now equivalent to super(<containing classname>, self) as per the docs.

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