for循环跳过一个角色？

Question

我在python中有一个for循环，它跳过了字符串中的最后一个字符，我试着像这样打印变量： for i in "125": print (i) 它没有打印5，这是我的脚本：

    OctalBinary1 = {
          "0" : "000",
          "1" : "001",
          "2" : "010",
          "3" : "011",
          "4" : "100",
          "5" : "101",
          "6" : "110",
          "7" : "111"
}
def toBinaryOctal(x):
          counter = 0
          sum_var = ""
          fin_var = ""
          for i in x:
                    counter += 1
                    sum_var += str(i)
                    if (counter != 3):
                               for x , y in OctalBinary1.items():
                                        if x == sum_var:

                                                  fin_var += OctalBinary1[x]
                                                  sum_var = ""
                                        else:
                                             print ("Did not find a match")
                                             print (i)

          return fin_var




print (toBinaryOctal("125"))

Answer 1

for i in x:
    counter += 1
    sum_var += str(i)

    if (counter != 3):

当for循环到达"5"时，计数器将在行if (counter != 3)处为3，因此它将在之后立即中断循环。这就是为什么你没有得到"5"输出。