Foundational Python for Data Science

3

Sequences

Errors using inadequate data are much less than those using no data at all.

Charles Babbage

In This Chapter

• Shared sequence operations

• Lists and tuples

• Strings and string methods

• Ranges

In Chapter 2, “Fundamentals of Python,” you learned about collections of types. This chapter introduces the group of built-in types called sequences. A sequence is an ordered, finite collection. You might think of a sequence as a shelf in a library, where each book on the shelf has a location and can be accessed easily if you know its place. The books are ordered, with each book (except those at the ends) having books before and after it. You can add books to the shelf, and you can remove them, and it is possible for the shelf to be empty. The built-in ...