List membership

It is possible to check if a value is a member of a list using the in keyword. For example:

    >>> random_list = [2, 1, 0, 8, 3, 1, 10, 9, 5, 4]

In this list, we could check if the number 6 is a member:

    >>> 6 in random_list
    False
    >>> 4 in random_list
    True