[Python-Dev] Weak Dictionary Iteration Behavior in Python 3 (original) (raw)

Armin Ronacher armin.ronacher at active-4.com
Sun Sep 14 11:35:52 CEST 2008

Hi,

Josiah Carlson <josiah.carlson gmail.com> writes:

i = list(d.keys()) Obviously that doesn't solve the problem. list() consumes the generator one after another, objects can still die when the list is created. Imagine the following example which uses threads::

from time import sleep
from weakref import WeakKeyDictionary
from threading import Thread

class Foo(object):
    pass

d = WeakKeyDictionary()
l = []

for x in range(100000):
    obj = Foo()
    d[obj] = None
    l.append(obj)
del obj


def iterater():
    for item in list(d.keys()):
        pass

Thread(target=iterater).start()

while True:
    del l[0]

Regards, Armin

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