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85 lines
2.0 KiB
85 lines
2.0 KiB
#!/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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import weakref |
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import gc |
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class Obj(): |
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def __init__(self, v=None) -> None: |
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self._v = v |
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self._k = None |
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if v: v.setK(self) |
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def setK(self,k): |
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self._k = k |
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def __del__(self): |
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print(f"Delete {self=} -> {self._v} {self._k}") |
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k1 = Obj() |
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k2 = Obj() |
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k3 = Obj() |
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k4 = Obj() |
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k5 = Obj(k4) |
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d = weakref.WeakKeyDictionary() |
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def ppp(n): |
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print(f"Dump: {n=}") |
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print(f"{gc.get_count()}, {gc.get_stats()}, {gc.garbage}") |
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for i in d: |
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print(f"<*> - {i=} {d[i]=}") |
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d[Obj(k1)] = "k1" |
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d[Obj(k2)] = "k2" |
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d[Obj(k3)] = "k3" |
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ppp(1) |
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del k2 |
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k4 = k5 = None |
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gc.collect() |
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ppp(2) |
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k3 = None |
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gc.collect() |
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ppp(3) |
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print("------> Inizio della seconda parte") |
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k1 = Obj() |
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k2 = Obj() |
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k3 = Obj() |
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d[k1] = weakref.ref(Obj(k1)) |
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d[k2] = weakref.ref(Obj(k2)) |
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d[k3] = weakref.ref(Obj(k3)) |
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print(f"{k1 in d=}") |
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ppp(4) |
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del k2 |
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gc.collect() |
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ppp(5) |
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k3 = k1 = None |
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gc.collect() |
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ppp(6) |