Python Conditional Statements

Used to make decisions in a program based on conditions.

• if

If the condition is True, the block will execute.

age = 21
 
if age >= 18:
    print("you can vote")

output

you can vote

Syntax:

if condition:
    print(" ")

Note

Indentation is required in Python to define the block.

• if-else

If the condition is True, if block runs
If False, else block runs

age = 12
 
if age >= 18:
    print("you can vote")
else:
    print("you cannot vote")

output

you cannot vote

Syntax:

if condition:
    print(" ")   # runs if True
else:
    print(" ")   # runs if False

• elif

Used to check multiple conditions.

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

output

Grade B

Syntax:

if condition1:
    print(" ")
elif condition2:
    print(" ")
else:
    print(" ")

Note

• Only one block will execute
• elif means “else if”
• Conditions are checked from top to bottom

Question

Write a program in Python to check age category:

• < 13 → child

• 13–18 → teenager

• 18+ → adult

age = int(input("enter age: "))
 
if age < 13:
    print("You are a child")
elif age >= 13 and age <= 18:
    print("You are a teenager")
else:
    print("You are an adult")

output

enter age: 14
You are a teenager

Question

Write a program in Python to check username and password

username = input("enter username: ")
password = input("enter password: ")
 
if username == "admin" and password == "pass":
    print("Login successful")
else:
    print("Invalid username or password")

output

enter username: admin
enter password: pass
Login successful

Question

Write a program in Python to check if a number is a multiple of 5 or not

num = int(input("enter a number: "))
 
if num % 5 == 0:
    print("Number is a multiple of 5")
else:
    print("Number is not a multiple of 5")

output

enter a number: 20
Number is a multiple of 5

Question

Write a program in Python to check if a number is odd or even

num = int(input("enter a number: "))
 
if num % 2 == 0:
    print("Number is even")
else:
    print("Number is odd")

output

enter a number: 7
Number is odd

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