python循环回到for循环中的前一个元素

Question

如何在 python 中执行以下代码我是 python 的新手，遇到了麻烦，请有人帮忙

objects = [............] // Array
for (i=0; i<objects.length(); i++) {
    if(readElement(objects[i])){
        //do something
    } else {
      i--; // so that same object is given in next iteration and readElement cant get true
    }
}

Answer 1

您是否考虑过使用递归？

def func(objects,i):
    if i == len(objects):
        return
    if readElement(objects[i]){
        #do something
        func(objects,i+1)
    else 
        func(objects,i)--; # so that same object is given in next iteration and readElement cant get true
    }
objects = [............] # list
func(objects,0)

否则，您可以这样做(非常非 Pythonic，但仅根据您的要求使用 for 循环):

objects = [............] # Array
func(objects,0)
M = 10E6 # The maximum number of calls you think is needed to readElement(objects[i])
for i in xrange(objects)
    for j in xrange(M):
        if readElement(objects[i]):
            #do something
            break