Python While Loop

while Loop in Python

A while loop in Python is used to repeat a block of code as long as a condition remains true. Unlike a for loop, which runs for a fixed number of times, a while loop continues executing until its condition becomes false.

How the while Loop Works

• Python first checks the condition.
• If the condition is True, the loop body runs.
• After each iteration, the condition is checked again.

Example:

count = 1

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

Real-Life Example

• Think about charging a phone.
• You keep charging it while the battery is not full.
• Once it reaches 100%, you stop.

Using break in a while Loop

The break statement stops the loop immediately.

Example:

while True:
    number = int(input("Enter a number: "))
    if number == 0:
        break

Using continue in a while Loop

The continue statement skips the current iteration.

Example:

num = 0

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

Common Mistake: Infinite Loop

A while loop becomes infinite if the condition never changes.

Example:

while True:
    print("Running forever")

Always make sure the loop condition can eventually become false.

Conclusion

The while loop is powerful but dangerous if misused. Use it when repetition depends on a condition, not a count. Use for loops when the number of iterations is known. Knowing when not to use while is as important as knowing how to use it.