[issue44857] class member varibles assigned member functions create a circular reference

[Cliff Cordeiro]

New submission from Cliff Cordeiro :

This class is not collected by the gc without a custom __del__ method to del or 
assign None to self.fn:

import gc

class Leak:
def __init__(self):
self.fn = self.x

def x(self):
pass


gc.set_debug(gc.DEBUG_SAVEALL)

l = Leak()
del l
gc.collect()

for item in gc.garbage:
print(item)

--
components: Interpreter Core
messages: 399165
nosy: cliff.cordeiro
priority: normal
severity: normal
status: open
title: class member varibles assigned member functions create a circular 
reference
type: resource usage
versions: Python 3.8

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[issue44857] class member varibles assigned member functions create a circular reference

[Cliff Cordeiro]

Cliff Cordeiro  added the comment:

It looks like the collector does detect the cycle and that's why it ends up in 
garbage with gc.DEBUG_SAVEALL set. Sorry about that.

--
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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