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Table of Contents

Variable in Python Programming with Example

In this lesson, we will learn about the variable in Python programming and its application, along with an example.

What is Variable

A variable is like a container that stores information which can be used and manipulated by a program. Variables have names, and these names are used to access the stored data.

Video Explanation

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Think variable as a box having a name where you can keep a piece of data that you can use later in your program. You can also change the data stored in a variable whenever you want.

A variable has three key concept and they are:

Name: This is the label you give to the variable.
Value: This is the information you want to store in the variable.
Data Type: This indicates what kind of data the variable is holding (e.g., a number, text, etc.). We will discuss about it in our next lesson.

Let's see some real-life examples of variables. Image you are organizing a birthday party and need to keep track of various details. So let's see how you can store those details in variables.

You need to store the total number of guest coming to the party.

You can use Variable Name: guest_count and store the value 20 in it like.

guest_count = 20

You need to store the name of the person whose birthday it is.

birthday_person = "Alice"

You need to remember the date of the party.

party_date = "2024-06-15"

You need to keep track of how much money you have for the party.

budget = 5000.00

You need to know if the party will be held indoors.

is_indoors = True

How to Declare Variable in Python

Unlike other programming languages like C, C++ or Java, Python has no command for declaring a variable. A variable is created in Python the moment we assign a value to it.

Let's see some examples for more understanding.

Example 1

To declare an integer and float variable in Python.

x = 5
x = 4.23

Here, we have declared a variable x and assigned it the value 5, making it an integer variable. We can reuse the same variable to store a different type of value. As you can see on the second line, the same variable x is now used to store the float value 4.23, so the variable x now becomes a float variable.

An integer variable is used to store whole numbers, such as 56, 8, and 493, which do not have a decimal part. A float variable, on the other hand, is used to store numbers with a decimal point, such as 2.3, 18.12, and 294.0.

Example 2

To declare a string variable in Python.

y = "apple"

Here, we have declared a variable y and assigned it the string value "apple", making it a string variable.

Example 3

To declare a boolean variable in Python.

z = True

Here, we have declared a variable z and assigned it the boolean value True, making it a boolean variable.

A boolean variable is used to store logical values such as True or False.

Example 4

To declare multiple variables and assign multiple values in a single line.

a, b, c, d = 5, 4.26, "apple", True

a=5; b=4.26; c="apple"; d=True

Here, we have declared four variables: a, b, c, and d, and assigned them the values 5, 4.26, "apple", and True, respectively, in a single line. This can be done in two different ways: using commas (,) or semicolons (;). You can use whichever method you prefer.

Example 5

To declare same value in multiple variables in a single line.

a=b=c=15

Here, we have declared three variables: a, b, and c, and assigned the same value of 15 to all of them in a single line.

Test Your Knowledge

Attempt the questions in the exercise to check whether you have understood the lesson clearly.

Exercise

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