2.3 How do we use variables

We use variables in several ways, mainly in:

• Declaration and Initialization - Assigning a value to a variable creates the variable and reserves a memory location for it.

Example 2.3.1

age = 14
name = "Kim"

• Storing Data - Variables hold data that can be used and manipulated throughout the program.

Example 2.3.2

score = 95

• Retrieving Data - The stored value in a variable can be accessed and used in operations.

Example 2.3.3

print(score)

95

• Updating Data - Variables can be reassigned new values during the program's execution.

Example 2.3.4

score = 100

Exercise 2.3.1 - Write a Python program by first declaring a variable called city. Set (initialize) city to the name of your favorite city. Print the name of your favorite city by using the city variable.

^{You can refer to Output topic if you need help with the print() function.}

_{Exercise 2.3.1 - Model Answer - Make sure to work out the exercise before checking the model answer.}