Python - While Loop

Introduction

Python's while loop is a flexible pattern that repeatedly runs a piece of code if a given condition is met. This page offers explanations of the while loop's usage in addition to real-world examples that demonstrate how to use it.

Example :

# Example: Simple While loop

count = 0

while count < 5:
    # Loop body
    print(count)
    count += 1

Infinite Loop

When using `while` loops, exercise caution to prevent accidental endless loops. Make sure the loop contains a way to finally set the condition to False, or use break to break out of the loop.

Example :

# Example: Infinite While loop

while True:
    # Loop body
    print("This is an infinite loop!")

Else Clause

The `while` loop, like the `for` loop, can also have a `else` clause that gets performed when the loop condition turns False. In the event that a break statement ends the loop, it is not executed.

Example :

# Example: While loop with else

counter = 0

while counter < 5:
    # Loop body
    print("Iteration : ", counter)
    counter += 1

else:
    # Executed when the condition becomes False
    print("Loop completed!")

Notes
- When the number of iterations is unknown in advance, the `while` loop works well.
- To prevent infinite loops, make sure there's a way to eventually set the loop condition to False.
- Code can be executed using the `else` clause in the event that the loop condition turns False.

Conclusion
In Python, handling repetitive tasks requires an understanding of and proficiency with the `while` loop. The `while` loop provides an effective option for situations requiring the iteration of dynamic data or the implementation of specified conditions.