缺少必需的位置参数：Python: self

Question

Getting an error :

TypeError: _get_request() missing 6 required positional arguments: 'id_list', 'id_item', 'to_be_sent', 'open', 'received', and 'sent'

When I am trying to call the function:

def _get_request(self, id: str,
                           id_list: List[str],
                           id_item: List[int],
                           to_be_sent: List[int],
                           open: List[int],
                           received: List[int],
                           sent: List[int]):



    return {
            'id': user_id,
            'num_results': 3,
            'id_list': uniqueVisitId,
            'id_item': id_item,
            'to_be_sent': need_to_be_sent,
            'open': open,
            'received': received,
            'sent': sent
    }

By:

self._get_request(
          {
           'id': 'x',
            'id_list': ['a', 'x'],
            'id_item': [1, 2],
            'to_be_sent': [1, 0],
            'open': [0, 0],
            'received': [0, 0],
            'sent': [0, 0]
          }
     )

Any guess why my function cant recognize the positionial arguments which I am passing over?

Answer 1

Because you are passing a dictionary and not arguments...

You should pass the arguments in order without Dict syntax:

self._get_request('x', ['a', 'x'], [1, 2],  [1, 0],   [0, 0],[0, 0], [0, 0])

Answer 2

Use ** before the dict items to parse them as key=value in functions

def foo(*, a, b):
    return a, b


dict = {'a': 1, 'b': 2}
print(foo(dict)) # -> missing
print(foo(**dict)) # -> returns (1, 2)

Answer 3

You are passing it only one argument — a dictionary. If you are just writing specific calls to get_request(), and/or the dictionary will always have that set of specified keys, do what adir said. If the dictionary you are passing it comes from somewhere else and may have varying keywords. then you can use dictionary unpacking like this:

# Assigning it just for the example, might be the result from a function or whatever you're doing
request_info_dict = {
                     'id': 'x',
                     'id_list': ['a', 'x'],
                     'id_item': [1, 2],
                     'to_be_sent': [1, 0],
                     'open': [0, 0],
                     'received': [0, 0],
                     'sent': [0, 0]
                   }
self._get_request(**request_info_dict)