Weak References in python

Question

I have been trying to understand how python weak reference lists/dictionaries work. I\'ve read the documentation for it, however I cannot figure out how they work, and what the

Answer 1

Just want to point out that weakref.ref does not work for built-in list because there is no __weakref__ in the __slots__ of list. For example, the following code defines a list container that supports weakref.

import weakref

class weaklist(list):
    __slots__ = ('__weakref__',)

l = weaklist()
r = weakref.ref(l)