我如何实例化此继承的类

Question

Ok this should be trivial, but i am stuck- the code is existing and should be fine.

 class Connect(object):
    def __init__(self, database, user, password, host, port):
        super(Connect, self).__init__()
        self.database = database
        self.user = user
        self.password = password
        self.host = host
        self.port = port

 class Process(Connect):
    def __init__(self, **kwargs):
        super(Process, self).__init__(**kwargs)

I can instantiate Connect easily

local_connection=Connect(database, user, password, host, port)

How do I instantiate Process?

If I do Process(database, user, password, host, port ) - Error is - TypeError: init () takes exactly 6 arguments (1 given)

If I do

Process(local_connection) 

Error is - TypeError: init () takes exactly 1 argument (2 given)

If i try

Process()

Errorr is - TypeError: init () takes exactly 6 arguments (1 given)

Answer 1

You can fix this in two ways:

1. create a Process 's object along with argument's name as:

    >>> Process(database='database', user='user', password='password', host='host', port='port') <__main__.Process object at 0x7f4510150a10> 

2. OR, Use *args along with **kwargs in Process.__init__() as:

    class Process(Connect): def __init__(self, *args, **kwargs): super(Process, self).__init__(*args, **kwargs) 

   and just pass param to __init__() without arguments as:

    >>> Process('database', 'user', 'password', 'host', 'port') <__main__.Process object at 0x7f4510150950> 

Please also refer: What does ** (double star) and * (star) do for parameters? for knowing the difference between *args and **kwargs .