How to access python collections

How to access python collections? Since set stores an unordered collection, we cannot access it through indexes. Accessing an element in a set is actually determining whether an element is in the set.

For example, a set that stores the names of classmates:

>>> s = set(['Adam', 'Lisa', 'Bart', 'Paul'])

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We can use the in operator to determine:

Is Bart a classmate in this class?

>>> 'Bart' in s
True

Is Bill a classmate in this class?

>>> 'Bill' in s
False

Is bart a classmate in this class?

>>> 'bart' in s
False

NOTE:

It appears that case matters, 'Bart' and 'bart' are considered two different elements.

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