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61 lines
1.6 KiB
61 lines
1.6 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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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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