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.. Usage in Python. While Loop. 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. For and while are the two main loops in Python. So far everything in the body of the loop has been run on each pass. Python While Loop. The while loop has two variants, while and do-while, but Python supports only the former. If you already know the working of for Loop, then understanding the while Loop will be very easy for you. Let’s create a small program that executes a while loop. 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. Python break and continue statements. A while loop statement in Python programming language repeatedly executes a target statement as long as a given condition is true.. Syntax. Always be aware of creating infinite loops accidentally. When we want to repeat a process 10 times, we put it in a loop. While loops. 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. 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. If we want a process, we can also loop it forever. The condition may be any expression, and true is any non-zero value. Loops are either infinite or conditional. share | improve this question | follow | edited Apr 5 '20 at 23:58. When its return true, the flow of control jumps to the inner while loop. Python While 循环语句. the inner while loop executes to completion.However, when the test expression is false, the flow of control … Cycles are called consecutive operations. 21 1 1 gold badge 1 1 silver badge 5 5 bronze badges. The while loop executes the codes contained in it continuously repeatedly while a condition is being met. In this program, we’ll ask for the user to input a password. We generally use this loop when we don't know the number of times to iterate beforehand. Julie Julie. 9,864 11 11 gold badges 43 43 silver badges 58 58 bronze badges. If the condition is initially false, the loop body will not be executed at all. Gino Mempin. while expression: statement(s) Here, statement(s) may be a single statement or a block of statements with uniform indent. The while loop in Python is used to iterate over a block of code as long as the test expression (condition) is true. 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. asked Feb 4 '17 at 13:21. When do I use them? The while loop contains a boolean expression and the code inside the loop is repeatedly executed as long as the boolean expression is true. Syntax of while Loop in Python while test_expression: Body of while. You can control the program flow using the 'break' and 'continue' commands. If it is False, then the loop is terminated and control is passed to the next statement after the while loop body. 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 syntax of a while loop in Python programming language is −. 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. python while-loop. While Loop. Python while loop keeps reiterating a block of code defined inside it until the desired condition is met..