Inheriting methods from a parent class

Question

I have the parent method:

 def move(self,dx,dy):
     self.x += dx
     self.y += dy

which will move a ex: Point(1,1) move(2,3) -> Point(3,4)

I have a child function which needs to contain that same method, how do I call it?

score 0 · Answer 1 · answered Dec 06 '15 at 01:45

0

If your child class function has a different name, just use call self.move(argx, argy). All methods are inherited along to be available on the instance.

If your child method has the same name (and thus overrides the parent method), you can use super(ChildClass, self).move(argx, argy) to call it. If you are using Python 3, you can omit the arguments to super() altogether and just use super().move(argx, argy).

answered Dec 06 '15 at 01:45

Martijn Pieters

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TypeError: unsupported operand type(s) for +=: 'Point' and 'int' is the error it gives me – andrchr Dec 06 '15 at 01:52
@andrchr: you are responsible for making sure the method still makes sense. Your subclass has assigned a `Point` class to `self.x` or `self.y`. – Martijn Pieters Dec 06 '15 at 01:53
How would I go about changing that? – andrchr Dec 06 '15 at 01:54
1

I don't know, you didn't share any code. – Martijn Pieters Dec 06 '15 at 01:55

score 0 · Answer 2 · answered Dec 06 '15 at 01:45

0

Your code should look like this:

class A(object):
    def move(self, dx, dy):
        self.x += dx
        self.y += dy


class B(A):
    def foo(self, dx, dy):
        self.move(dx, dy)

answered Dec 06 '15 at 01:45

dursk

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That gives me an ongoing error – andrchr Dec 06 '15 at 01:51

Inheriting methods from a parent class

2 Answers2