我一直在python TypeError中收到错误消息：＆＃39; str＆＃39;对象不可调用

Question

我一直在创建一个密码，我收到了一条错误消息：

  

TypeError：＆＃39; str＆＃39;对象不可调用

我的代码目前是：

alphabet = "abcdefghijklmnopqrstuvwxyz"
key = 5
cipher = ' ' 

choice = input('Do you wish to encrypt or decrypt? E/D')
if not choice == 'D' and not choice == 'E':
    raise Exception('Must enter E or D for Encrypt or Decrypt')
user_input = input('Please enter your word')
cipher2 = cipher (user_input, alphabet, choice, key)
print('your encrypted mesaage 2 is: ' + cipher2)

#Method can encrypt or decrypt the entered word
def cipher(plain_text, alphabet, choice, key):
    cipher = ''
    for c in plain_text:
        if c in alphabet:
            if choice == 'E':
                val1 = alphabet.index(c)
                val2 = key
                cipher += alphabet[ (val1 + val2) % (len(alphabet))]
            elif choice == 'D':
                cipher = cipher + alphabet[ (alphabet.index(c)-key) % (len(alphabet))]
return cipher

错误在第九行：

    cipher2 = cipher (user_input, alphabet, choice, key)

如果有人能

，请感谢他们的帮助

Answer 1

您的字符串cipher（第3行中的违规）与您的函数cipher具有相同的名称：

print (type(cipher)) #  class <'str'>

cipher2 = cipher (user_input, alphabet, choice, key) # cipher is string here not function

当您拨打此支票时cipher输入string，请更改您的字符串名称或功能名称。