mirror of https://github.com/python/cpython
122 lines
2.1 KiB
Python
122 lines
2.1 KiB
Python
import gc
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def test_list():
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l = []
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l.append(l)
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gc.collect()
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del l
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assert gc.collect() == 1
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def test_dict():
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d = {}
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d[1] = d
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gc.collect()
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del d
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assert gc.collect() == 1
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def test_tuple():
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# since tuples are immutable we close the loop with a list
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l = []
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t = (l,)
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l.append(t)
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gc.collect()
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del t
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del l
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assert gc.collect() == 2
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def test_class():
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class A:
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pass
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A.a = A
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gc.collect()
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del A
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assert gc.collect() > 0
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def test_instance():
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class A:
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pass
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a = A()
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a.a = a
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gc.collect()
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del a
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assert gc.collect() > 0
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def test_method():
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# Tricky: self.__init__ is a bound method, it references the instance.
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class A:
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def __init__(self):
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self.init = self.__init__
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a = A()
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gc.collect()
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del a
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assert gc.collect() > 0
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def test_finalizer():
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# A() is uncollectable if it is part of a cycle, make sure it shows up
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# in gc.garbage.
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class A:
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def __del__(self): pass
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class B:
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pass
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a = A()
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a.a = a
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id_a = id(a)
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b = B()
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b.b = b
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gc.collect()
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gc.garbage[:] = []
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del a
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del b
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assert gc.collect() > 0
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assert id(gc.garbage[0]) == id_a
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def test_function():
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# Tricky: f -> d -> f, code should call d.clear() after the exec to
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# break the cycle.
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d = {}
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exec("def f(): pass\n") in d
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gc.collect()
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del d
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assert gc.collect() == 2
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def test_del():
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# __del__ methods can trigger collection, make this to happen
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thresholds = gc.get_threshold()
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gc.enable()
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gc.set_threshold(1)
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class A:
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def __del__(self):
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dir(self)
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a = A()
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del a
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gc.disable()
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apply(gc.set_threshold, thresholds)
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def test_all():
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enabled = gc.isenabled()
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gc.disable()
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assert not gc.isenabled()
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test_list()
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test_dict()
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test_tuple()
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test_class()
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test_instance()
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test_method()
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test_finalizer()
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test_function()
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test_del()
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# test gc.enable() even if GC is disabled by default
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gc.enable()
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assert gc.isenabled()
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if not enabled:
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gc.disable()
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test_all()
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