Access parent class instance attribute from child class instance?

python class instance parent
user975135 picture user975135 · Jun 6, 2012 · Viewed 38.7k times · Source

How to access "myvar" from "child" in this code example:

class Parent():
    def __init__(self):
        self.myvar = 1

class Child(Parent):
    def __init__(self):
        Parent.__init__(self)

        # this won't work
        Parent.myvar

child = Child()

Answer

Japan Shah picture Japan Shah · Jun 6, 2012

Parent is a class - blue print not an instance of it, in OOPS to access attributes of an object it requires instance of the same, Here self/child is instance while Parent/Child are classes...

see the answer below, may clarify your doubts.

class Parent():
    def __init__(self):
        self.myvar = 1

class Child(Parent):
    def __init__(self):
        Parent.__init__(self)

        # here you can access myvar like below.
        print self.myvar

child = Child()
print child.myvar

Related questions

__init__ and arguments in Python

I want to understand arguments of the constructor __init__ in Python. class Num: def __init__(self,num): self.n = num def getn(self): return self.n def getone(): return 1 myObj = Num(3) print myObj.getn() RESULT: 3 I call the getone() method: …

Read More
python: create instance of class in another class (with generic example)

I'm learning python via book and internet and I'm stuck on a class issue. 2 questions: How do I create an instance of one class in another (separate) class? How do I pass variables between the class and the nested(?) class? …

Read More
Getting an instance name inside class __init__()

While building a new class object in python, I want to be able to create a default value based on the instance name of the class without passing in an extra argument. How can I accomplish this? Here's the basic …

Read More