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Python While Loop

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The while loop in Python runs a block of code as long as a condition is True.

🔹 Syntax

while condition:
    # code block

The loop continues until the condition becomes False.

🔹 Simple While Loop Example

i = 1

while i <= 5:
    print(i)
    i += 1

🔹 Using Break in While Loop

i = 1

while i < 10:
    print(i)
    if i == 5:
        break
    i += 1

🔹 Using Continue in While Loop

i = 0

while i < 5:
    i += 1
    if i == 3:
        continue
    print(i)

🔹 Else with While Loop

i = 1

while i < 4:
    print(i)
    i += 1
else:
    print("Loop finished")

🔹 Infinite Loop Example

Be careful: if the condition never becomes False, the loop will run forever.

while True:
    print("This is an infinite loop")
    break

🔹 Use Case Example

password = ""

while password != "admin":
    password = input("Enter password: ")

print("Access granted")

🧪 Try It Yourself

Practice writing while loops with counters, conditions, and control statements like break and continue.

Practice Questions

Q1. Write a Python program to print numbers from 1 to 10 using a while loop.

Q2. Write a Python program to print even numbers from 2 to 20 using a while loop.

Q3. Write a Python program to accept numbers from the user until they enter 0.

Q4. Write a Python program to use break to stop a loop when the number is 7.

Q5. Write a Python program to use continue to skip printing number 5 in a loop from 1 to 10.

Q6. Write a Python program to count backwards from 10 to 1 using a while loop.

Q7. Write a Python program to print the multiplication table of 3 using a while loop.

Q8. Write a Python program to keep asking for a password until the correct one is entered.

Q9. Write a Python program to sum all numbers from 1 to 50 using a while loop and print the result.

Q10. Write a Python program to use else with a while loop to print a message after the loop ends normally.

Python While Loop Quiz

Q1: What is a while loop used for?

A. Running code once
B. Making conditions
C. Repeating while a condition is true
D. Defining variables

Q2: What will happen if the condition is always True?

A. Error
B. Loop stops
C. Infinite loop
D. Prints False

Q3: What keyword is used to exit a loop?

A. exit
B. break
C. stop
D. end

Q4: What keyword is used to skip one iteration?

A. skip
B. next
C. continue
D. stop

Q5: Can you use else with while loop?

A. No
B. Yes
C. Only in for loops
D. Only in functions

Q6: What happens if the condition is False at the beginning?

A. Loop runs once
B. Loop runs infinitely
C. Loop is skipped
D. Error occurs

Q7: What is the output of this loop: i = 0; while i < 3: print(i); i += 1?

A. 0 1 2
B. 1 2 3
C. 0 1 2 3
D. Infinite loop

Q8: When is the else part of a while loop executed?

A. When loop starts
B. On break
C. Only if loop ends normally
D. Every time

Q9: Which loop is better for repeating until user input is correct?

A. for
B. while
C. if
D. def

Q10: What is required in a while loop to avoid infinite loop?

A. else block
B. input
C. condition change
D. print statement
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