Prev Next

Python If...Else Statements

The if statement is used for decision-making operations. It contains a logical expression that evaluates to either True or False. Python supports the usual logical conditions from mathematics:

  • Equals: a == b
  • Not Equals: a != b
  • Less than: a < b
  • Less than or equal to: a <= b
  • Greater than: a > b
  • Greater than or equal to: a >= b

Example 1: Simple If Statement

Check if a number is positive.

# Simple if statement
number = 5
if number > 0:
    print("The number is positive.")

The number is positive.

Example 2: If...Else Statement

Determine if a person is eligible to vote based on age.

# If...else statement
age = 17
if age >= 18:
    print("You are eligible to vote.")
else:
    print("You are not eligible to vote.")

You are not eligible to vote.

Example 3: If...Elif...Else Statement

Classify a number as positive, negative, or zero.

# If...elif...else statement
number = 0
if number > 0:
    print("Positive number")
elif number == 0:
    print("Zero")
else:
    print("Negative number")

Zero

Example 4: Nested If Statements

Check if a person is eligible to drive based on age and possession of a driving license.

# Nested if statements
age = 20
has_license = True
if age >= 18:
    if has_license:
        print("You can drive.")
    else:
        print("You need a driving license.")
else:
    print("You are too young to drive.")

You can drive.

Example 5: Using Logical Operators

Check if a student has passed based on marks in two subjects.

# Using logical operators
math_mark = 85
science_mark = 92
if math_mark >= 50 and science_mark >= 50:
    print("Student has passed.")
else:
    print("Student has failed.")

Student has passed.

Explanation: The if statement evaluates the condition and executes the code block if the condition is True. The elif and else statements provide additional conditions and code blocks.

Prev Next