How to call method of second parent class using method of child class in python?

Question

Below is my code:

class Parent1(object):
    def __init__(self):
        print "!!! ___initialization Parent1___ !!!"

    def method(self):
        print "*** method of Parent1 is called ***"


class Parent2(object):
    def __init__(self):
        print "!!! ___initialization Parent2___ !!!"

    def method(self):
        print "*** method of Parent2 is called ***"

class Child(Parent1,Parent2):
    def __init__(self):
        print "!!! ___initialization Child___ !!!"

    def method(self):
        super(Child,self).method()
        print "*** method of Child is called ***"


Ch = Child()
Ch.method()

I want to call method() of Parent2 class using object of child class. Conditions are only child class object should be created and no change in child class declaration (class Child(Parent1,Parent2): should not changed.)

James · Accepted Answer · 2016-08-05 12:36:56Z

4

Parent2.method(self)

That's all you need - the instance.method() is just syntactic sugar for ClassName.method(instance), so all you need to do is call it without the syntactic sugar and it'll do fine.

I changed the Child class to this:

class Child(Parent1,Parent2):
    def __init__(self):
        print "!!! ___initialization Child___ !!!"

    def method(self):
        super(Child,self).method()
        print "*** method of Child is called ***"
        Parent2.method(self)

And:

# Out:
$ python c.py
!!! ___initialization Child___ !!!
*** method of Parent1 is called ***
*** method of Child is called ***
*** method of Parent2 is called ***

You get the expected output perfectly fine.

answered Aug 5, 2016 at 12:36

James

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4 Comments

chepner Over a year ago

You might as well change super(Child, self).method() to Parent1.method(self) as well. This class hierarchy is not designed to use super properly.

Praveen kumar Over a year ago

@James: Thanks for the solution. Is this the only way to do it? Is there any other way? Can't it be done using super() or decorator?

James Over a year ago

@Praveenkumar I'm not aware of one, but I'm by no means an expert on Python inheritance, it's possible there's some way I don't know of.

Praveen kumar Over a year ago

@James. Yes I will. :)

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