Data types in Python

2.5. Sequence data type

A sequence is an ordered collection of values. The sequence is a powerful, fundamental abstraction in computer science. Sequences are not instances of a particular built-in type or abstract data representation, but instead a collection of behaviors that are shared among several different types of data. That is, there are many kinds of sequences, but they all share common behavior. In particular,

Length. A sequence has a finite length. An empty sequence has length 0.

Element selection. A sequence has an element corresponding to any non-negative integer index less than its length, starting at 0 for the first element.

Python includes three main data types that are sequences. They are 

1. String
2. List
3. Tuple

"2.3 Sequences" by John DeNero is licensed under CC BY 3.0