在机器语言的角度来看，本质都是 conditional jump. 细微的区别在于for循环和while循环会在 loop statement...
timeit.timeit(while_loop, number=1)) print('for loop\t\t', timeit.timeit(for_loop, numb...
1、使用场景不同：知道执行次数的时候一般用for，条件循环时一般用while。2、两种循环在构造死循环时的区别：while循环里的条件被看成表达式，因此，当用while构造死循环时，里面的TRUE实际上被看成永远为真的表达式，这种情况容易产生混淆，有些工具软件如PC-Lint就会认为出错了，因此构造死循环时，最好...
区别：1、使用场景不同：知道执行次数的时候一般用for，条件循环时一般用while。2、两种循环在构造死循环时的区别：while循环里的条件被看成表达式，因此，当用while构造死循环时，里面的TRUE实际上被看成永远为真的表达式，这种情况容易产生混淆，有些工具软件如PC-Lint就会认为出错了，因此构造死循环时，...
The While Loop The Pythonwhile loopexecutes a block of statements repeatedly as long as the condition is TRUE. We notice that it is a bit similar to theif statement. However, unlike thewhile loop, the if statement executes only once if its condition is TRUE. ...
c++loop 12th Jun 2018, 4:21 PM Kuyann + 1 Your question is like asking "Why not use a while loop with an increasing integer inside it instead of a for loop?" Each loop has its own purposes. Of course you can somehow, but it is far from being smart. ...
Conclusion question: How many ways of writing a loop in VBScript? My answer is 7: "For ... Next". "While ... Wend". "Do While ... Loop". "Do Until ... Loop". "Do ... Loop While". "Do ... Loop Until". "For Each ... Next" - Used with arrays and collections. See ...
while和for是 Python 中常用的两种实现循环的关键字，它们的运行效率实际上是有差距的。比如下面的测试代码：importtimeitdefwhile_loop(n=100_000_000):i=0s=0whilei<n:s+=ii+=1returnsdeffor_loop(n=100_000_000):s=0foriinrange(n):s+=ireturnsdefmain():print('whileloop\t\t',...
and to do them with less room for error by the programmer (the type that might lead to an inadvertent “spinning” into an infinite loop) than awhileloop allows. For example, an iterator might be connected to a clockmyClocksuch that it ‘ticks’ every second returning the current time, ...
1、For循环使用场景: (1)主要用来遍历/循环 序列、集合和字典 (2)循环使用 else 语句 在 python 中,for … else 表示这样的意思,for 中的语句和普通的没有区别,else 中的语句会在循环正常执行完(即 for 不是通过 break 跳出而中断的)的情况下执行,while … else 也是一样。 ** 2、while循环用法 ** ...