我一直在python TypeError中得到错误消息：“str”对象不是callab

Question

我创建了一个密码，收到了一条错误消息：

TypeError: 'str' object is not callable

我目前的代码是：

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)

如果有人能帮忙，我会很感激的

Answer 1

字符串cipher（在第3行中定义）与函数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

当您调用这个check cipher类型时，它是string，所以请更改您的字符串名或函数名。你知道吗