# Pastebin aNaV0tQ1
~ $ python
Python 3.11.5 (main, Aug 30 2023, 00:13:08) [Clang 14.0.7 (https://android.googlesource.com/toolchain/llvm-project 4c603efb0 on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> class A: pass
...
>>> def foo(a):
...     a = weakref.ref(a)
...     assert a() is None
...
>>> import weakref
>>> foo(A())
>>>