Khalid Ahmad Khattak

Lesson 4 – Data Types

Every value in Python has a specific data type. Understanding these types helps you decide how to store information such as text, numbers, calculations, and True/False conditions. This lesson explains the four most common data types used by beginners.

Main Python Data Types

• String (str) – text such as words or messages
• Integer (int) – whole numbers without decimals
• Float (float) – numbers with decimals
• Boolean (bool) – either True or False

Example 1: Text (String)

message = "Hello, Python"
print(message)
print(type(message))
        

Output:

Hello, Python
<class 'str'>
        

Example 2: Whole Number (Integer)

count = 25
print(count)
print(type(count))
        

Output:

25
<class 'int'>
        

Example 3: Decimal Number (Float)

price = 3.99
print(price)
print(type(price))
        

Output:

3.99
<class 'float'>
        

Example 4: True/False (Boolean)

is_student = True
print(is_student)
print(type(is_student))
        

Output:

True
<class 'bool'>
        

Example 5: Mixing Data Types

name = "Ali"
age = 16

print("Student name is", name)
print("Age next year will be", age + 1)
        

Output:

Student name is Ali
Age next year will be 17
        

Why Data Types Matter

Data types decide what actions Python can perform. For example, you can add two numbers together, but you cannot add a number to a word. Understanding data types helps you avoid errors and write more powerful programs.

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Quiz: Test Your Understanding

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