python - 属性错误 : 'str' object has no attribute 'decode' Having this error on the second line of my code

Question

这是我的代码，

if __name__ == "__main__":
    key = "0123456789abcdef0123456789abcdef".decode('hex')  /this line is having error
    plain_1 = "1weqweqd"
    plain_2 = "23444444"
    plain_3 = "dddd2225"
    print(plain_1)
    print(plain_2)
    print(plain_3)

    cipher = Present(key)

输出

AttributeError: 'str' object has no attribute 'decode'

Answer 1

这是因为你试图解码一个字符串。 bytes类型可以解码，str类型不能解码。你应该编码 (key.encode()) this (or use b"foo") before, to convert the string to a bytes object .

>>> foo = "adarcfdzer"
>>> type(foo)
<class 'str'>
>>> foo = foo.encode()
>>> type(foo)
<class 'bytes'>
>>> foo = foo.decode()
>>> type(foo)
<class 'str'>