Data Structures

Data structures are types of variables that represent different forms of information that you might want to create, store, and manipulate in your program. Together with control flow methods, data structures are the other fundamental building block of any programming language. In this section, we will go through some of the most common data structures in Python, starting with strings.

Strings

Strings are sequences of characters that are typically used to represent textual information (for example, a message). A Python string is denoted by any given textual data inside either single- or double-quotation marks. For example, in the following code snippet, the a and b variables hold the same information:

a = 'Hello, world!'
b = "Hello, world!"

Since strings are roughly treated as sequences in Python, common sequence-related operations can be applied to this data structure. In particular, we can concatenate two or more strings together to create...