Introduction

This lesson is part of our complete Python course for beginners. In this lesson, you will learn about variables and data types in Python, which are the foundation of writing any Python program.

Understanding variables and data types in Python is essential because every program stores and processes data.

What are Variables in Python?

Variables in Python are used to store data values. They act as containers that hold information which can be used and modified in a program.

Example:

x = 10
name = “John”

In this example, x stores a number and name stores text.

Rules for Creating Variables

When creating variables in Python, follow these rules:

• Variable names must start with a letter or underscore
• They cannot start with a number
• They are case-sensitive
• Avoid using reserved keywords

What are Data Types in Python?

Data types define the type of value a variable can hold. Python automatically detects the data type based on the assigned value.

Common Data Types in Python

1. Integer (int)

Stores whole numbers

Example:
age = 25

2. Float (float)

Stores decimal numbers

Example:
price = 99.99

3. String (str)

Stores text data

Example:
name = “Python”

4. Boolean (bool)

Stores True or False values

Example:
is_active = True

Type Checking in Python

You can check the type of a variable using the type() function.

Example:

x = 10
print(type(x))

Why Variables and Data Types are Important

Variables and data types in Python help you:

• Store and manage data
• Perform operations on data
• Build logic in programs

Therefore, understanding variables and data types in Python is a crucial step in programming.

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Conclusion

Now you understand variables and data types in Python and how they are used to store different types of data.

In the next lesson, you will learn about operators in Python.

Next Lesson

Operators in Python