Class variable and dict

Asked Apr 12 '23 at 16:05

Active Apr 12 '23 at 16:05

Viewed 39 times

Why print(b.__dict__) prints{'state': 'Init'} I understand, but why does print(b._di) print{'state': 'Init'}?

class A:
    _di = {}
    
    def __init__(self):
        self.__dict__ = self._di


class B(A):
    def __init__(self):
        super().__init__()
        self.state = "Init"


b = B()
print(b.__dict__) # {'state': 'Init'}
print(b._di) # {'state': 'Init'}

asked Apr 12 '23 at 16:05

Anne Maier

6

`self.__dict__ = self._di` assigns the **reference** to the same dictionary referred by `self._di` to `self.__dict__`. – Michael Butscher Apr 12 '23 at 16:07
2

Related: [How do I pass a variable by reference?](https://stackoverflow.com/q/986006/11082165) – Brian61354270 Apr 12 '23 at 16:13
because `b.__dict__` and `b._di` *are the same object*, because of `self.__dict__ = self._di`. – juanpa.arrivillaga Apr 12 '23 at 16:46
1

Here's a classic that everyone using python should know and understand: https://nedbatchelder.com/text/names.html – juanpa.arrivillaga Apr 12 '23 at 16:47

Class variable and __dict__

0 Answers0

Class variable and dict