Membership operators in python

Membership operators are used to test whether a value or variable is found in a sequence (string, list, tuple, set and dictionary).

Operator	Description
in	Return true if value/variable is found in the sequence, else false.
not in	Return True if value/variable is not found in the sequence, else false

>>> primeNumbers = [2, 3, 5, 7, 11]
>>> 2 in primeNumbers
True
>>> 4 in primeNumbers
False
>>> 4 not in primeNumbers
True

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