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89 lines
2.7 KiB
89 lines
2.7 KiB
3 years ago
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#!/usr/bin/env python3
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# MIT License
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#
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# Copyright (c) 2023 Eugenio Parodi <ceccopierangiolieugenio AT googlemail DOT com>
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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# Example inspired by
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# https://stackoverflow.com/questions/39838793/python-object-is-being-referenced-by-an-object-i-cannot-find
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import gc, weakref, time
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class Foo():
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__slots__ = ('__weakref__','a','b')
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def __init__(self, a=1234) -> None:
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self.a = a
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self.b = lambda : self.a
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def f(self):
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return self.a
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# def __del__(self):
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# print(f"Deleted {self}")
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def pobjs():
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for i,o in enumerate(gc.get_objects()[-100:]):
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ss = str(o)
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if "Foo" in ss:
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print(f" * {i} - {ss}")
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v1 = {'b':2345}
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print(f"\nStart {gc.isenabled()=}")
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# print(f"{gc.set_debug(gc.DEBUG_LEAK)=}")
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def _gccb(phase,info):
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print(f" ---> {gc.garbage=}")
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print(f" ---> {phase=} {info=}")
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# gc.callbacks.append(_gccb)
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print("\n############# Phase 1 ##################")
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foo = Foo(v1)
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bar =foo.b
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wrfoo = weakref.ref(foo)
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wrbar = weakref.ref(bar)
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wrf = weakref.WeakMethod(foo.f)
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# print(f"{gc.get_referents(foo)=}")
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# print(f"{gc.get_referrers(foo)=}")
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# print(f"{gc.get_referents(v1)=}")
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# print(f"{gc.get_referrers(v1)=}")
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# print(f"{gc.get_count()=}")
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print(f"{foo.a=} - {foo.b=} - {foo.f()=} - {bar()=}")
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print(f"{wrfoo()=} {wrbar()=} {wrf()=}")
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del foo
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print(f"{gc.collect()=}")
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print(f"{bar()}")
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# print(f"{gc.get_referents(v1)=}")
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# print(f"{gc.get_referrers(v1)=}")
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print(f"{wrfoo()=} {wrbar()=} {wrf()=}")
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bar = None
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print(f"{wrfoo()=} {wrbar()=} {wrf()=}")
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time.sleep(4)
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print(f"{wrfoo()=} {wrbar()=} {wrf()=}")
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print(f"{gc.collect()=}")
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print(f"{wrfoo()=} {wrbar()=} {wrf()=}")
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print(f"{gc.garbage=}")
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print(f"End {gc.get_count()=}")
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