Python while loop

In this tutorial, you will learn about the while loop.

A while loop is used to repeatedly execute a block of code as long as a specified condition is True.

Note: The while loop will stop when the condition becomes False.

If the while condition is true, then the loop’s body is executed repeatedly.

If the while condition is false, then the loop’s body will not be executed.

Syntax:

while condition:
    # Code to execute repeatedly

Example 1: Basic while loop

count = 0
while count < 4:
    print(count)
    count = counter + 1  # Increment the counter

Output:

In this example, the loop continues until count is no longer less than 4.

Example 2: while loop with break

You can use the break statement to exit the loop early.

i = 0
while i < 5:
    print(i)
    if i == 3:
        break  # Exit the loop when i is 3
    i += 1

Output:

Example 3: while loop with else

Similar to a for loop, you can use an else clause with a while loop. The else block will run if the loop completes without encountering a break.

i = 0
while i < 3:
    print(i)
    i += 1
else:
    print("Loop finished!")

Output:

Example 4: Infinite loop

A while loop can become an infinite loop if the condition never becomes False.

while True:
    print("This is an infinite loop!")
    break  # Use a break to avoid an actual infinite loop

Without the break, this would print endlessly. Infinite loops are commonly used when waiting for specific conditions to occur.

Python while loop – Questions and Answers

Python While loop – Objective Questions (MCQs)

i = 1
while i < 4:
print(i)
i += 1;

Related Python While_loop Topics