A "while False" loop, on the other hand, is never true: > while False: In order to stop it, you'll need to close the interpreter or send Python a KeyboardInterrupt by pressing CTRL+C.Ī "while True" loop is always true and runs forever. In this case, the condition is always True, so the loop will run forever. The simplest while loops in Python are while True and while False: > while True: As soon as the condition evaluates to false, the loop terminates and no more statements will be executed. As long as the condition is true, the loop body (the indented block that follows) will execute any statements it contains. A conditional expression is a statement that evaluates to True or False. You initiate the loop with the while keyword, then set the condition to be any conditional expression.
In Python, indefinite iteration generally takes the following form: while ( CONDITIONAL EXPRESSION ): Let's get started! Review of Python While Loops
While loop python how to#
More specifically, you'll learn how to write a Python while loop with multiple conditions.
In this article, you'll take a more advanced look at indefinite iteration in Python. These two forms of iteration are known as definite (often implemented using a for loop and Python next function) and indefinite (often implemented using a while loop). Iteration is the process by which a program repeats a series of steps a certain number of times or while a certain condition is met.
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