File: slots_bool_len.py

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class A:
    def __bool__(self):
        print('__bool__')
        return True
    def __len__(self):
        print('__len__')
        return 1

class B:
    def __len__(self):
        print('__len__')
        return 0

print(bool(A()))
print(len(A()))
print(bool(B()))
print(len(B()))