使用递归加密消息，python

我需要编写一个递归函数来加密消息 在python中将所有小写字符转换为下一个字符（z转换为a）。 到目前为止，这是我的代码，但我不知道如何进一步，或者如何更正错误

sentence = input("Enter a message: \n")
letter_number = 0

def encrypt_sentence (s, number):
    if letter_number == len(sentence) - 1:
       return(s)
    else:
        if s[letter_number] == chr(122):
            return encrypt_sentence(chr(ord(s[letter_number])-25), letter_number + 1)
        else:
            return encrypt_sentence(chr(ord(s[letter_number])+1), letter_number + 1)

print("Encrypted message")
print(encrypt_sentence(sentence, letter_number))

---

我已经修复了你的代码，现在它可以工作了

sentence = input("Enter a message: \n")
letter_number = 0

def encrypt_sentence (sentence):
    if sentence:
        if sentence == chr(122):
            return chr(ord(sentence[letter_number])-25)
        else:
            return chr(ord(sentence[letter_number])+1)
print("Encrypted message")
ris = ''
for word in sentence:
    ris += encrypt_sentence(word)
print(ris)

---

当您递归时，您将

ord（…）+1

作为

语句

参数传递。

ord

返回一个整数，您将此整数作为

语句

传递。整数不是某事物的列表；5[2]没有意义。