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60 lines
1.6 KiB
60 lines
1.6 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 C: |
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def method(self): |
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print("method called!") |
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return 1234 |
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c = C() |
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r = weakref.ref(c.method) |
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print(f"{r=}") |
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print(f"{r()=}") |
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r = weakref.WeakMethod(c.method) |
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print(f"{r=}") |
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print(f"{r()=}") |
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print(f"{r()()=}") |
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del c |
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print(f"{gc.collect()=}") |
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print(f"{r()=}") |
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def m3(): |
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print("Method 3") |
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m = m3 |
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l = lambda : print("lambda1") |
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r3 = weakref.WeakMethod(m3) |
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r2 = weakref.WeakMethod(lambda : print("Method 2")) |
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r2() |
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r3()
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