python - 如何修复: "TypeError: ' bool' object is not subscriptable"

Question

我目前正在使用基本的客户端/服务器应用程序并实现一个简单的 RSA/公钥身份验证系统。我遇到了这个错误，但我一生都无法弄清楚。

我正在使用最新版本的 python。

服务器.py

def getUserData(username):
    global privateKeysFilename
    filename = privateKeysFilename

    with open(filename, "r") as keysFile:
        for line in keysFile:
            line = [token.rstrip("\n") for token in line.split(",")]
            if(username == line[0]):

                if DEBUG:
                    print("\n=== DEBUG\nUser data = %s\n===\n" %(line))

                return line
    return False



def running(self):
    global BUFFER, DEBUG, start, final

    while 1:
        print('Waiting for a connection')
        connection, client_address = self.server_socket.accept()
        connection.send("Successful connection!".encode())

        x = randint(start, final)
        self.fx = function(x)
        connection.send(str(x).encode())

        try:
            # Output that a client has connected
            print('connection from', client_address)
            write_connection()
            # Set the time that the client connected
            start_time = datetime.datetime.now()

            # Loop until the client disconnects from the server
            while 1:
                # Receive information from the client
                userData = connection.recv(BUFFER)

                #data = connection.recv(1024).decode()

                if(userData != "0"):

                    #define split character 
                    ch = ","

                    userData = userData.split(ch.encode())
                    username = userData[0]
                    r = int(userData[1])

                    userData = getUserData(username)

                    e, n = int(userData[1]), int(userData[2])
                    y = modularPower(r, e, n)

                    if DEBUG:
                        print("=== DEBUG\ne = %d\nn = %d\nr = %d\ny = %d\n===\n" %(e, n, r, y))

                    if(self.fx == y):
                        #if authentication passed
                        connection.send("Welcome!!!".encode())
                    else:
                        connection.send("Failure!!!".encode())



                if (userData != 'quit') and (userData != 'close'):
                    print('received "%s" ' % userData)
                    connection.send('Your request was successfully received!'.encode())
                    write_data(userData)
                    # Check the dictionary for the requested artist name
                    # If it exists, get all their songs and return them to the user
                    if userData in self.song_dictionary:
                        songs = ''
                        for i in range(len(self.song_dictionary.get(userData))):
                            songs += self.song_dictionary.get(userData)[i] + ', '
                        songs = songs[:-2]
                        print('sending data back to the client')
                        connection.send(songs.encode())
                        print("Sent", songs)
                    # If it doesn't exist return 'error' which tells the client that the artist does not exist
                    else:
                        print('sending data back to the client')
                        connection.send('error'.encode())
                else:
                    # Exit the while loop
                    break
            # Write how long the client was connected for
            write_disconnection(start_time)
        except socket.error:
            # Catch any errors and safely close the connection with the client
            print("There was an error with the connection, and it was forcibly closed.")
            write_disconnection(start_time)
            connection.close()
            data = ''
        finally:
            if data == 'close':
                print('Closing the connection and the server')
                # Close the connection
                connection.close()
                # Exit the main While loop, so the server does not listen for a new client
                break
            else:
                print('Closing the connection')
                # Close the connection
                connection.close()
                # The server continues to listen for a new client due to the While loop

这是有错误的输出:

Traceback <most recent call last>:
    File "server.py", line 165, in running
    e, n = int(userData[1]), int(userData[2])
TypeError: 'bool' object is not subscriptable

任何帮助将不胜感激! :)

Answer 1

通过使用userData[n]，您正在尝试访问可下标对象中的第n个元素。

这可以是列表、字典、元组甚至是字符串。

您看到的错误意味着您的对象 userData 不是前面提到的任何类型，它是一个 bool ( True 或 False )

由于它是调用函数getUserData()的结果，我建议您检查该函数的返回类型并确保它是上述类型并修改您的代码逻辑。

[更新]

通过检查函数getUserData()，它看起来只在包含用户名的情况下返回行，如果不包含用户名，则返回False，这在主代码中未处理。

我建议对代码进行此编辑，以将成功状态包含到返回值中，如下所示。

def getUserData(username):
    global privateKeysFilename
    filename = privateKeysFilename

    with open(filename, "r") as keysFile:
        for line in keysFile:
            line = [token.rstrip("\n") for token in line.split(",")]
            if(username == line[0]):

                if DEBUG:
                    print("\n=== DEBUG\nUser data = %s\n===\n" %(line))

                return True, line
    return False, None

然后在代码中，当您调用 getUserData() 时，您首先检查是否成功，然后再像这样解析数据

userData = getUserData(username)
if userData [0]:
    e, n = int(userData[1]), int(userData[2])
    y = modularPower(r, e, n)
else:
    # Your failure condition