Python while Loops: Repeating Tasks Conditionally

Python’s while loop enables you to execute a block of code repeatedly as long as a given condition remains true. Unlike for loops, which iterate a known number of times, while loops are ideal for situations where the number of iterations isn’t known upfront.

Loops are a pretty useful construct in Python, so learning how to write and use them is a great skill for you as a Python developer.

By the end of this tutorial, you’ll understand that:

• while is a Python keyword used to initiate a loop that repeats a block of code as long as a condition is true.
• A while loop works by evaluating a condition at the start of each iteration. If the condition is true, then the loop executes. Otherwise, it terminates.
• while loops are useful when the number of iterations is unknown, such as waiting for a condition to change or continuously processing user input.
• while True in Python creates an infinite loop that continues until a break statement or external interruption occurs.
• Python lacks a built-in do-while loop, but you can emulate it using a while True loop with a break statement for conditional termination.

With this knowledge, you’re prepared to write effective while loops in your Python programs, handling a wide range of iteration needs.