Why a super() statement ?

[srfpala]

In   Precord  text p 15    Show a BitMap uses:

super(MyFrame, self).__init__(parent, id, title, pos, size, style, name)

The above statement seems superfluous, and ASAIK offers nothing new to the App.

Why is it needed ?
Bob

[Mike Driscoll]

It's not needed. But it doesn't hurt anything either. Also I think it is recommended to use super() that way I'm Python 3.

So while it's not needed it is conventional to use it in the latest version of Python.

Mike

--

[Gerhard Schmidt]

Hi,

it might not be needed there but it's needed to ensure that all __init__
methods of any superclasses are called.

Not calling super in all __init__ methods might break initialization
when deriving from multiple classes way down the hierarchy.

an example

you have a class A, Class B derived from A and Class C derived from
Class B and a Class D that has nothing to do with class A or B.

The __init__ method of class C call super which calls the B.__init__, in
B.__init__ super is called again and A.__init__ is called. if A.__init__
doesn't call super the execution goes back to B.__init__ and C.__init__
after the methods are finished, but D.__init__ is never called because
the super call in A.__init__ will trigger that.

That's what in experienced in one of my projects I'm migrated from
python 2 to python3. I might be wrong here, but that's what I'm
experiencing.

Before super you called the __init__ method of any class you derived
from directly. Now the super call has to handle that.

Regards
Estartu

Am 23.06.19 um 02:13 schrieb Mike Driscoll:

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