Conditional Statements

What are Conditional Statements?

Conditional statements are used to make decisions in a Python program.

They execute different blocks of code depending on whether a condition is True or False.

1. if Statement

The if statement executes code when a condition is True.

age = 20

if age >= 18:
    print("You are an adult")

You are an adult

2. if-else Statement

The else block executes when the if condition is False.

age = 16

if age >= 18:
    print("Eligible")
else:
    print("Not Eligible")

Not Eligible

3. elif Statement

The elif statement is used when we need to check multiple conditions.

marks = 75

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

Grade A

4. Nested if Statement

A nested if means using one if statement inside another if statement.

age = 20
has_id = True

if age >= 18:
    if has_id:
        print("Entry allowed")

Entry allowed

5. Practical Example

Conditional statements can be used to check whether a number is positive, negative or zero.

number = 10

if number > 0:
    print("Positive")
elif number < 0:
    print("Negative")
else:
    print("Zero")

Positive

Quick Quiz