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The most basic data structure in Python is the sequence.
Each element of a sequence is assigned a number - its position or index.
There are certain things you can do with all sequence types.
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Lists respond to the and * operators much like strings; they mean concatenation and repetition here too, except that the result is a new list, not a string.
In fact, lists respond to all of the general sequence operations we used on strings in the prior chapter.
In addition, Python has built-in functions for finding the length of a sequence and for finding its largest and smallest elements.
The list is a most versatile datatype available in Python which can be written as a list of comma-separated values (items) between square brackets.