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# A contains everything
class A:
def __contains__(self, key):
return True
a = A()
print(True in a)
print(1 in a)
print(() in a)
# B contains given things
class B:
def __init__(self, items):
self.items = items
def __contains__(self, key):
return key in self.items
b = B([])
print(1 in b)
b = B([1, 2])
print(1 in b)
print(2 in b)
print(3 in b)
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