Linked entries in a list of class instances

Asked May 15 '18 at 09:12

Active May 15 '18 at 09:35

Viewed 16 times

I have the following code:

class test:
    def __init__(self, a=[None,None], b=[None,None], c=[None,None]):
        self.a = a
        self.b = b
        self.c = c

new = [test(), test()]
new[0].a[0] = 15
new[1].a

I cannot understand why the second entry changes as well. How did it turn out that both elements of the list "new" are the same object?

EDIT: For the solution, try this link" What is the pythonic way to avoid default parameters that are empty lists?

edited May 15 '18 at 09:35

asked May 15 '18 at 09:12

Cindy Almighty

1

check this, https://stackoverflow.com/questions/1132941/least-astonishment-and-the-mutable-default-argument, basiclly all the list in there are shared – Netwave May 15 '18 at 09:13
Thank you, this is perfect, but I didn't know how to google it. Is there something I should do with this question now? Close it somehow? – Cindy Almighty May 15 '18 at 09:29
it is marked as duplicated and that is all, so anywone with the same doubts will be redirected to the other answer also. Thanks! – Netwave May 15 '18 at 09:30
Great! Is there an answer someplace how to rewrite it properly to make it work? – Cindy Almighty May 15 '18 at 09:34
Ah, found it. never mind! – Cindy Almighty May 15 '18 at 09:35

Linked entries in a list of class instances

0 Answers0