Question

我试图遍历一个字符串并找到某个子字符串的所有出现，例如：

contant = "old men old men old men"

def this (l,n):
  while n < 20:
    m = contant[l:].index("o")
    l = m + 3
    n += 1
    print(m,l)

this(0,1)

这只会一次又一次地返回nnumbers 0 3和5 8，而不是遍历整个字符串。

Answer 1

尝试一下

value = "old men old men old men"

location = -1

# Loop while true.
while True:
    # Advance location by 1.
    location = value.find("o", location + 1)

    # Break if not found.
    if location == -1: break

    # Display result.
    print(location)

输出

0
8
16

循环内的字符串索引仅返回两个值

1 个答案: