classes and inheritance in python3

Question

class Myclass(list):

    def remove_max(self):
        self.remove(max(self))

l = [1,2,3]

object = Myclass(l)

object.remove_max()

print(object)

in Myclass which inherits from class list why does the Myclass(l) assign the object a value [1,2,3]? And even if we gave it a string say 'abc' instead of list l as an input why is the value of object set as the list ['a'. 'b']?

Could you please clarify the code and the question? I would guess the last four lines are not supposed to have indentation? And what do you mean with "assign"? object = Myclass(l) assigns [1,2,3] as the list constructor would. The next line removes the element 3. — Jonathan Striebel
– Jonathan Striebel, Commented Jun 15, 2017 at 13:37
yeah im sorry for the incorrect indentation.i have edited the code now — mightyMouse
– mightyMouse, Commented Jun 16, 2017 at 14:52

Serge Ballesta · Accepted Answer · 2017-06-16 15:00:03Z

1

As you do not define an __init__ method, the parameter given at construction time is given to the immediate parent, here list. And when you build a list from an iterable, you get the list composed from the different items. So:

if l is a list list(l) is a copy of the initial list
if s is a string (which is an iterable of characters), list(s) is the list composed with the characters from s

answered Jun 16, 2017 at 15:00

Serge Ballesta

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