print('while loop\t\t', timeit.timeit(while_loop, number=1)) print('for loop\t\t', timeit.timeit(for_loop, number=1)) print('for loop with increment\t\t', timeit.timeit(for_loop_with_inc, number=1)) print('for loop with test\t\t', timeit.timeit(for_loop_with_test, number=...
Increment the sequence with 3 (default is 1): forxinrange(2,30,3): print(x) Try it Yourself » Else in For Loop Theelsekeyword in aforloop specifies a block of code to be executed when the loop is finished: Example Print all numbers from 0 to 5, and print a message when the...
在我看来,类似的代码不是while循环,而是for循环,在运行时编辑列表: originalLoopRange = 5 loopList = list(range(originalLoopRange)) timesThroughLoop = 0 for loopIndex in loopList: print(timesThroughLoop,"count") if loopIndex == 2: loopList.pop(3) print(loopList) print(loopIndex) timesThrough...
这应该是Python独有的特性吧,循环也可以有else。当循环正常结束(没有break)后,就会执行else代码段: for i in range(3): print(i) else: print('loop ends') for i in range(3): if i > 1: break print(i) else: print('loop ends') 猜猜这段代码的输出吧,如果没有把握就亲自执行一下就明白了。
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: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 importtimeit defwhile_loop(n=100_000_000):i=0s=0whilei<n:s+=i i+=1returns
2 Python 嵌套 for 循环 在Python 中,for 循环用于迭代序列,例如列表、字符串、元组,以及其他可迭代对象,例如范围。在 Python 中使用嵌套 for 循环的语法: # outer for loop for element in sequence # inner for loop for element in sequence: body of inner for loop ...
A while loop is a programming concept that, when it's implemented, executes a piece of code over and over again while a given condition still holds true. The above definition also highlights the three components that you need to construct the while loop in Python: The while keyword; A cond...
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for循环不需要执行边界检查和自增操作，没有增加显式的 Python 代码（纯 Python 代码效率低于底层的 C 代码）。当循环的次数足够多，就出现了明显的效率差距。可以再增加两个函数，在for循环中加上不必要的边界检查和自增计算：importtimeitdefwhile_loop(n=100_000_000):i=0s=0whilei<n:s+=ii+...
C++版本 //Counter-controlled repetition with the for statement#include<iostream>usingstd::cout;usingstd::endl;intmain() {//for statement header includes initialization//loop-continuation condition and incrementfor(intcounter =1; counter <=10; counter++) ...