Python for循环启动计数器初始化 [英] Python for loop start counter initialization

问题描述

for iteration in range(len(list) - 1):
  index = iteration +1 #This is the line which has no effect on the inner loop
  for index in range(len(list)):
    if list[iteration] > list[index]:
      newmin  = list[index]
      newminindex = index        
  if iteration != newminindex :
    swapnumbers(list,iteration, newminindex)

以上是我为选择排序算法编写的代码段.但是，我看到内循环开始计数器始终从0开始.请求专家评论.

The above is a code snippet I wrote for selection sort algorithm. However I see the inner loop start counter always starting from 0. Request for expert comment.

推荐答案

for index in range(len(list))循环执行循环主体，首先将index设置为0，然后设置为1，然后设置为2，依此类推.到len(list) - 1. index的先前值将被忽略并覆盖.如果要index从iteration + 1开始，请使用range的2参数形式:

The for index in range(len(list)) loop executes the loop body with index first set to 0, then 1, then 2, etc. up to len(list) - 1. The previous value of index is ignored and overwritten. If you want index to start at iteration + 1, use the 2-argument form of range:

for index in range(iteration + 1, len(list)):

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