Variables, Expressions, and Statements

This section covers:

Storing values in variables

Evaluating expressions

Statements

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Variables

Variables are containers for storing values. There are many different types of values, but some simple ones are strings (any combination of characters, like “apple” or “100%”), numbers (ex: 4 or 0.5), and booleans (true or false).

To start off, you can declare a variable with a specific name and a value.

After it’s declared, you can assign a different value to the variable, or you can use the current value of the variable.

Input Function

Python’s input function allows you to collect input from the user.

Here, it’s helpful to use a variable to store whatever the user inputs.

Expressions

An expression is a combination of values, variables, operators (ex: math operators like + - * /), and function calls (to be explained in a later section!) that can be evaluated to a single value.

Examples of expressions include:

Statements

A statement is like an instruction. We’ve already seen examples of statements: declaring and assigning a variable is a statement, and using print is also a statement.

This is different than an expression because a statement does something. However, you can use expressions in your statements. Here is an example of declaring a variable and assigning it to the evaluation of an expression:

In the upcoming sections, we will learn more about the other types of statements!

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