Understanding Python’s if-else and if-elif-else Statements

Python’s if-else statements let your program make decisions. ✅ if-else handles two conditions (true/false). ✅ if-elif-else is used when multiple conditions must be checked.

Think of it like a traffic light 🚦: Green = Go, Red = Stop, Yellow = Prepare. Python uses these statements to guide program flow.

1. Python if-else Statement

The if-else statement lets you run one block of code if the condition is True, and another if the condition is False.

Syntax:

if condition:
    # Code runs if True
else:
    # Code runs if False
    

Example: Voting Eligibility

Check if someone is old enough to vote:

age = 25
if age >= 18:
    print("Eligible to vote")
else:
    print("Not eligible to vote")
    

2. Python if-elif-else Statement

Use if-elif-else when you need to test more than two conditions. Python checks each condition from top to bottom and executes the first one that’s True.

Syntax:

if condition1:
    # Runs if condition1 is True
elif condition2:
    # Runs if condition2 is True
else:
    # Runs if no condition is True
    

Example: Shopping Discount

Apply discount based on purchase amount:

amount = 2500

if amount > 10000:
    discount = 20
elif amount > 5000:
    discount = 10
elif amount > 1000:
    discount = 5
else:
    discount = 0

print("Final Payable Amount:", amount - (amount * discount / 100))
    

3. Nested if Statements

You can put one if inside another. This is useful when a decision depends on two levels of conditions.

num = 15
if num > 0:
    if num % 2 == 0:
        print("Positive even number")
    else:
        print("Positive odd number")
    

Conclusion

✅ Use if-else for two-way decisions.
✅ Use if-elif-else for multiple conditions.
✅ Use nested if for layered decisions.

By mastering these, you can build programs that think logically and react differently based on inputs.

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