how to call parent class methods in python?

Question

I am writing a class in python.

class my_class(object):
    def __init__(self):
    # build my objects 
    def foo(self,*args,**kwargs):
    # do something with them

Then I would like to extend this class:

class my_extended_class(my_class):

But I can not figure out what is the correct way of accessing parent methods.

Shall I:

1) create an instance of a father object? at constructor time

def __init__(self):
    self.my_father=my_class()
    # other child-specific statements
    return self
def foo(self,*args,**kwargs):
    self.my_father.foo(*args,**kwargs)
    # other child-specific statements
    return self

2) call father methods 'directly'?

def foo(self,*args,**kwargs):
    my_class.foo(*args,**kwargs)
    # other child-specific statements
    return self

3) other possible ways?

would that work consistency across python versions 2.6 to 3.5? — 00__00__00
– 00__00__00, Commented Mar 30, 2018 at 6:08
Possible duplicate of Call a parent class's method from child class in Python? — ramganesh
– ramganesh, Commented Mar 30, 2018 at 6:08
yes, parameters to super are optional in python 3 but if you specify them for python2 compatibility it will work fine — avigil
– avigil, Commented Mar 30, 2018 at 6:10

avigil · Accepted Answer · 2018-03-30 06:12:45Z

7

Use super(ClassName, self)

class my_class(object):
    def __init__(self):
    # build my objects 
    def foo(self,*args,**kwargs):
    # do something with them

class my_extended_class(my_class):
    def foo(self,*args,**kwargs):
        super(my_extended_class, self).foo(*args,**kwargs)
        # other child-specific statements
        return self

Compatibility is discussed in How can I call super() so it's compatible in 2 and 3? but in a nutshell, Python 3 supports calling super with or without args while Python 2 requires them.

answered Mar 30, 2018 at 6:12

avigil

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Comments

Daniel Dang · Accepted Answer · 2018-03-30 06:21:44Z

3

You can use the super() method. For example:

class my_extended_class(my_class):
   def foo(self,*args,**kwargs):
      #Do your magic here 
      return super(my_extended_class, self).foo(self,*args,**kwargs)

You might go to this link and find other answers as well.

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

answered Mar 30, 2018 at 6:21

Daniel Dang

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