Print all items, using a while loop to go through all the index numbers thislist = ["apple", "banana", "cherry"]i = 0 while i < len(thislist): print(thislist[i]) i = i + 1 Try it Yourself » Learn more about while loops in our Python While Loops Chapter.Looping...
whilei <6: print(i) i +=1 Try it Yourself » Note:remember to increment i, or else the loop will continue forever. Thewhileloop requires relevant variables to be ready, in this example we need to define an indexing variable,i, which we set to 1. ...
现在我们可以从服务器获取 HTML 页面;为此,我们可以使用urllib模块: url ="https://www.w3schools.com/html/html_tables.asp"try: page = urllib2.urlopen(url)
编写While 循环 像for 循环一样,while 循环以关键字“while”开始。接下来,我们有一个条件,就像我们用来写一个 if 语句。让我们看一个例子: # writing your first while loop health = 10 while health > 0: print(health) health -= 1 # forgetting this line will result in infinite loop 去查查那个...
在while循环中需要有“continue”问题,而不是每次插入名称时都需要for循环。 public class StudentRun { public static void main(String[] args) { Scanner sc = new Scanner(System.in); String[] names = new String[50]; int[] rolls = new int[50]; int index = 0; while(true) { System.out....
breakIt is used to break out a for loop, or a while loop. i=1 whilei <9: print(i) ifi==3: break i+=1 continueIt is used to end the current iteration in a for loop (or a while loop), and continues to the next iteration. ...
while True: EatSausages() 您已经将输入类型称为Interger INT(INPUT()),因此您不必检查其类型INT是否会返回错误/异常,如果用户输入字符串 你不能len(type int) 可能的解决方案 为解决您的问题的命令 逆转字符串中的所有数字 isinstance(l1, int) 参考: https://www.w3schools.com/python/ref_func_isins...
In addition to this, JavaScript has a do...while loop, which is guaranteed to run at least once because it checks the condition after its body. You can rewrite this example in the following way: JavaScript let age; do { age = prompt('How old are you?'); } while (age < 18); ...
根据paused,调用mixer.music.pause()或mixer.music.unpause(): while loop: if event.type == pygame.KEYDOWN: if event.key == pygame.K_SPACE: paused = not paused if paused: mixer.music.pause() else mixer.music.unpause() 如何添加暂停和取消暂停功能,使整个游戏暂停和取消暂停在Pygame ...
While 循环 只要条件为“真”,当我们想要执行特定指令时,就会使用 while 循环。代码块执行后,执行将返回到代码块的开头。下面显示了一个示例。 代码: #while loop with continue statement while True: x=input('Enter the correct color:') if(x!='red'): print("Color needs to be entered as red") co...