The while loop contains a boolean expression and the code inside the loop is repeatedly executed as long as the boolean expression is true. Python while Loop: In the previous article, we have briefly discussed the for Loop in Python.. Now, it’s time to move to the next and last type of Loop statement which is while Loop. When do I use them? So far everything in the body of the loop has been run on each pass. We generally use this loop when we don't know the number of times to iterate beforehand. You can control the program flow using the 'break' and 'continue' commands. When its return true, the flow of control jumps to the inner while loop. 21 1 1 gold badge 1 1 silver badge 5 5 bronze badges. If it is False, then the loop is terminated and control is passed to the next statement after the while loop body. If the condition is initially false, the loop body will not be executed at all. Python While 循环语句. For and while are the two main loops in Python. Loops are either infinite or conditional. Python while loop keeps reiterating a block of code defined inside it until the desired condition is met.. The while loop has two variants, while and do-while, but Python supports only the former. If we want a process, we can also loop it forever. Let’s create a small program that executes a while loop. Gino Mempin. Python break and continue statements. share | improve this question | follow | edited Apr 5 '20 at 23:58. Julie Julie. In Python, while loops are constructed like so: while [a condition is True]: [do something] The something that is being done will continue to be executed until the condition that is being assessed is no longer true. How works nested while loop. A while loop statement in Python programming language repeatedly executes a target statement as long as a given condition is true.. Syntax. The syntax of the while loop in the simplest case looks like this: while some condition: a block of statements Python firstly checks the condition. While loops, like the ForLoop, are used for repeating sections of code - but unlike a for loop, the while loop will not run n times, but until a defined condition is no longer met. While Loop. While loop falls under the category of indefinite iteration.Indefinite iteration means that the number of times the loop is executed isn’t specified explicitly in advance. When we want to repeat a process 10 times, we put it in a loop. Cycles are called consecutive operations. The syntax of a while loop in Python programming language is −. If you already know the working of for Loop, then understanding the while Loop will be very easy for you. python while-loop. Python While Loop. Always be aware of creating infinite loops accidentally. the inner while loop executes to completion.However, when the test expression is false, the flow of control … The while loop executes the codes contained in it continuously repeatedly while a condition is being met. While loops. While Loop. Python 编程中 while 语句用于循环执行程序，即在某条件下，循环执行某段程序，以处理需要重复处理的相同任务。 The while loop in Python is used to iterate over a block of code as long as the test expression (condition) is true. Usage in Python. In Python, While Loops is used to execute a block of statements repeatedly until a given condition is satisfied.And when the condition becomes false, the line immediately after the loop in the program is executed. In this program, we’ll ask for the user to input a password. while expression: statement(s) Here, statement(s) may be a single statement or a block of statements with uniform indent. 9,864 11 11 gold badges 43 43 silver badges 58 58 bronze badges. Syntax of while Loop in Python while test_expression: Body of while. In the nested-while loop in Python, Two type of while statements are available:Outer while loop; Inner while loop; Initially, Outer loop test expression is evaluated only once.. asked Feb 4 '17 at 13:21. The condition may be any expression, and true is any non-zero value.