New submission from Eugene Kapun <[email protected]>:
This code shows that frozensets aren't really immutable. The same frozenset is
printed twice, with different content. Buggy functions are set_contains,
set_remove and set_discard, all in Objects/setobject.c
class bad:
def __eq__(self, other):
global f2
f2 = other
print_f2()
s1.add("querty")
return self is other
def __hash__(self):
return hash(f1)
def print_f2():
print(id(f2), repr(f2))
f1 = frozenset((1, 2, 3))
s1 = set(f1)
s1 in {bad()}
print_f2()
----------
components: Interpreter Core
messages: 103426
nosy: abacabadabacaba
severity: normal
status: open
title: It is possible to observe a mutating frozenset
type: behavior
versions: Python 3.1
_______________________________________
Python tracker <[email protected]>
<http://bugs.python.org/issue8435>
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