cython

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# cython: nonecheck=True
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#        ^^^ Turns on nonecheck globally
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import cython
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@cython.cclass
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class MyClass:
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    pass
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# Turn off nonecheck locally for the function
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@cython.nonecheck(False)
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def func():
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    obj: MyClass = None
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    try:
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        # Turn nonecheck on again for a block
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        with cython.nonecheck(True):
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            print(obj.myfunc())  # Raises exception
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    except AttributeError:
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        pass
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    print(obj.myfunc())  # Hope for a crash!
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