Question

为什么会出现此错误？

追踪（最近一次通话）：文件＆＃34; python＆＃34;，第6行，in IndexError：字符串索引超出范围

关于此代码

Cipher = input("Enter encrypted text:")
length = len(Cipher)
start = 0
decrypt=""
while length!=Cipher: 
  asc=ord(Cipher[int(start)]) #String index out of range
  if asc <=95:
    decrypt=decrypt+Cipher[start]
  elif asc >95 and asc <=110:
    num = asc
    num=num+13
    decrypt=decrypt+chr(num)
  elif asc>110 and asc<=122:
    num = asc
    num=num-13
    decrypt=decrypt+chr(num)
  else:
    decrypt=decrypt+""
  start=start+asc
print("DONE!")

我该如何解决？

Answer 1

Cipher是一个字符串，因此永远不会等于int，即int。 int（length），因为长度已经是一个int ...

Cipher = input("Enter encrypted text:")
length = len(Cipher)
start = 0
decrypt=""
while start!=length: #check for termination condition 
    asc=ord(Cipher[start])
    if asc <=95:
        decrypt=decrypt+Cipher[start]
    elif asc >95 and asc <=110:
        num = asc
        num = num+13
        decrypt=decrypt+chr(num)
    elif asc>110 and asc<=122:
        num = asc
        num = num-13
        decrypt=decrypt+chr(num)
    else:
        decrypt=decrypt+""
    start=start+1 # increment counter

Answer 2

Cipher = list(input("Enter encrypted text:"))
length = len(Cipher)
start = 0
decrypt=""
while start != length: 
  asc=ord(Cipher[start])
  if asc <=95:
    decrypt=decrypt+Cipher[start]
  elif asc >95 and asc <=110:
    num = asc
    num=num+13
    decrypt=decrypt+chr(num)
  elif asc>110 and asc<=122:
    num = asc
    num=num-13
    decrypt=decrypt+chr(num)
  start=start+1

print("DONE! Result: " + decrypt)

您可以在此处试用：https://repl.it/Nn05/0

我如何解决这个错误，它是一个移动13个字母的密码。

2 个答案: