🪜 Python Nested If Statement — Decisions Inside Decisions

Introduction 🌟

A nested if statement means placing one if (or elif/else) block inside another. It allows your program to make decisions that depend on multiple levels of conditions.

Note

💡 Nested conditions are useful when one decision depends on another.

1. Basic Nested If Structure 🧱

basic_nested_if.py

x = 20

if x > 10:
    print("x is greater than 10")

    if x > 15:
        print("x is also greater than 15")

The inner if runs only if the outer if is True.

2. Nested If With Else Blocks 🔗

nested_if_else.py

age = 18

if age >= 18:
    print("Adult")

    if age >= 21:
        print("Eligible for driving license")
    else:
        print("Not eligible for license yet")
else:
    print("Minor")

3. Nested If With Multiple Levels 🧠

multi_level_nested.py

num = 50

if num > 0:
    print("Positive number")

    if num % 2 == 0:
        print("Even number")

        if num > 25:
            print("Greater than 25")
        else:
            print("Less than or equal to 25")
    else:
        print("Odd number")
else:
    print("Negative number")

4. Nested If With User Input ⌨️

nested_input.py

username = input("Enter username: ")

if username == "admin":
    password = input("Enter password: ")

    if password == "1234":
        print("Login successful")
    else:
        print("Wrong password")
else:
    print("Unknown user")

5. Nested If With Logical Operators 🔗

nested_logic.py

marks = int(input("Enter marks: "))

if marks >= 50:
    print("Pass")

    if marks >= 75:
        print("Distinction")
    elif marks >= 60:
        print("First class")
    else:
        print("Second class")
else:
    print("Fail")

6. Avoiding Too Many Nested Conditions ⚠️

Deep nesting can make your code hard to read. Use elif or combine conditions to simplify logic.

avoid_deep_nesting.py

# Too nested
age = 22
if age >= 18:
    if age <= 60:
        print("Working age")

# Better version
if 18 <= age <= 60:
    print("Working age")

Note

🧼 Cleaner conditions improve readability and maintainability.

7. Real-World Example 🌍

real_world_example.py

email = input("Enter email: ")

if "@" in email:
    print("Valid email format")

    if email.endswith(".com"):
        print("Commercial domain detected")
    else:
        print("Non-commercial domain")
else:
    print("Invalid email")

Conclusion 🎉

>>“Nested if statements let your program make layered decisions — step by step.” ✨

You now understand how nested if statements work in Python! Want the next topic? Try Ternary Operators, Loops, While Loop, For Loop, or Control Flow Techniques. Just tell me! 😊