SEQUENCES
Strings, lists, and tuples are all examples of Python sequences. Sequences are ordered, named collections of data. Each item in the sequence can be accessed by specifying its position with an index, starting at 0. Strings are always sequences of characters, but lists and tuples can store almost any data type, and data can be mixed in a given list or tuple sequence.
You can create a list by including several data items between square brackets [ ], with items separated by commas.
A tuple is a sequence like a list; expect that once you create a tuple, you cannot change it. It is said to be immutable.
