• +91-9142290450

  • Hajipur, Bihar, 844101

☰
❮
❯

Python If...Else

← Previous Next →

Imagine you're writing a program that tells someone whether they can vote or not. The computer needs to decide based on the user's age — that's where Python’s if...else statements come in.

In simple terms, if...else lets your program make choices.

📌 Why We Use if...else

In real life, we make decisions like:

  • If it’s raining, take an umbrella.

  • If you're hungry, eat food. Else, skip lunch.

Python lets your code do the same thing.

✅ Basic if Statement

Let’s start with the simplest version:

age = 20

if age >= 18:
    print("You are eligible to vote.")

Here’s what’s happening:

  • The code checks the condition: age >= 18.

  • If it's True, it runs the indented block of code.

✅ if...else Statement

But what if the person is not eligible? We can handle that using else:

age = 16

if age >= 18:
    print("You are eligible to vote.")
else:
    print("You are not eligible to vote yet.")

Now your program reacts to both cases — eligible and not eligible.

✅ The elif Keyword (Else If)

Sometimes you have more than two choices. For that, use elif.

score = 85

if score >= 90:
    print("Grade: A")
elif score >= 75:
    print("Grade: B")
elif score >= 60:
    print("Grade: C")
else:
    print("Grade: F")

This checks each condition in order. The moment it finds one that’s True, it runs that block and skips the rest.

🧠 A Note on Indentation

Python doesn’t use curly braces {} to mark blocks of code.
Instead, it relies on indentation (usually 4 spaces):

if condition:
    # this must be indented
    do_something()

If you don’t indent properly, Python will give you an error.

🔀 Using if with Logical Operators

You can check multiple conditions using and, or, and not:

age = 25
citizen = True

if age >= 18 and citizen:
    print("You can vote.")

🧪 A Real-World Example

password = input("Enter password: ")

if password == "admin123":
    print("Access granted.")
else:
    print("Access denied.")

This is a basic login check — something you’ll find in many real applications.

✅ Quick Summary

Keyword What it does
if Checks a condition
else Runs if all if and elif are False
elif Additional condition checks
and, or, not Combine multiple conditions

Practice Questions

Q1. Write a Python program to check if a number is positive, negative, or zero.

Q2. Write a Python program to take the user's age and print whether they are a child, teenager, or adult.

Q3. Write a Python program to ask the user for a number and check if it is even or odd.

Q4. Write a Python program to get a number from the user and check if it is divisible by both 3 and 5.

Q5. Write a Python program to print the largest of three numbers entered by the user.

Q6. Write a Python program to check if a given year is a leap year.

Q7. Write a Python program to take a score and print the grade using if...elif...else statements.

Q8. Write a Python program to ask the user to enter a password and check if it’s correct (you can define the correct password in the code).

Q9. Write a Python program to check if a character entered by the user is a vowel or consonant.

Q10. Write a Python program to get two numbers from the user and print which one is bigger, or if they are equal.

← Previous Next →

Python

online coding class codepractice

Introduction to Python

Python Basics

Cotrol Structures

Data Structures

Date and Time

Functions and Module

File Handling

Python OOP

Advanced Concepts

Python DSA

Searching Algorithms

Sorting Algorithms

codepractice logo
Login
Go Back Top