Intro to Python
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Variables, Expressions, and Statements

This section covers:
Storing values in variables
Evaluating expressions
Statements
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.
is_the_sky_blue = True
favorite_fruit = "apple"
number_of_variables = 3
After it’s declared, you can assign a different value to the variable, or you can use the current value of the variable.
print(favorite_fruit) # prints "apple"
favorite_fruit = "kiwi"
print(favorite_fruit) # prints "kiwi" now
Input Function
Python’s input function allows you to collect input from the user.
name = input("What's your name?")
print("Hi, " + name + "!")
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:
4 * 5 # evaluates to 20
"tri" + "angle" # evaluates to "triangle"
number_of_variables - 1 # evaluates to 2
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:
new_variable = number_of_variables * 2
In the upcoming sections, we will learn more about the other types of statements!
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