QUANDL

stocks=['EOD/AAPL','EOD/MSFT','EOD/TSLA' ]
data=quandl.get(stocks,start_date="2015-12-31", end_date="2016-06-31", authtoken="5KykojjZ5rxPgKnV_8rL")
data

OUTPUT

---------------------------------------------------------------------------
InvalidRequestError                       Traceback (most recent call last)
<ipython-input-10-1af7ef2a7053> in <module>
      1 # importing muliple stock code
      2 stocks=['EOD/AAPL','EOD/MSFT','EOD/TSLA' ]
----> 3 data=quandl.get(stocks,start_date="2015-12-31", end_date="2016-06-31", authtoken="5KykojjZ5rxPgKnV_8rL")
      4 data

/anaconda3/lib/python3.7/site-packages/quandl/get.py in get(dataset, **kwargs)
     54         data = MergedDataset(args).data(params=kwargs,
     55                                         handle_not_found_error=True,
---> 56                                         handle_column_not_found=True)
     57     # If wrong format
     58     else:

/anaconda3/lib/python3.7/site-packages/quandl/model/merged_dataset.py in data(self, **options)
     34         # else fetch all the data and filter column indexes requested locally
     35         dataset_data_list = [self._get_dataset_data(dataset, **options)
---> 36                              for dataset in self.__dataset_objects__()]
     37
     38         # build data frames and filter locally when necessary

/anaconda3/lib/python3.7/site-packages/quandl/model/merged_dataset.py in <listcomp>(.0)
     34         # else fetch all the data and filter column indexes requested locally
     35         dataset_data_list = [self._get_dataset_data(dataset, **options)
---> 36                              for dataset in self.__dataset_objects__()]
     37
     38         # build data frames and filter locally when necessary

/anaconda3/lib/python3.7/site-packages/quandl/model/merged_dataset.py in _get_dataset_data(self, dataset, **options)
     71             updated_options = options.copy()
     72             updated_options = Util.merge_options('params', params, **updated_options)
---> 73         return dataset.data(**updated_options)
     74
     75     def _build_data_meta(self, dataset_data_list, df):

/anaconda3/lib/python3.7/site-packages/quandl/model/dataset.py in data(self, **options)
     45         updated_options = Util.merge_options('params', params, **options)
     46         try:
---> 47             return Data.all(**updated_options)
     48         except NotFoundError:
     49             if handle_not_found_error:

/anaconda3/lib/python3.7/site-packages/quandl/operations/list.py in all(cls, **options)
     13             options['params'] = {}
     14         path = Util.constructed_path(cls.list_path(), options['params'])
---> 15         r = Connection.request('get', path, **options)
     16         response_data = r.json()
     17         Util.convert_to_dates(response_data)

/anaconda3/lib/python3.7/site-packages/quandl/connection.py in request(cls, http_verb, url, **options)
     36         abs_url = '%s/%s' % (ApiConfig.api_base, url)
     37
---> 38         return cls.execute_request(http_verb, abs_url, **options)
     39
     40     @classmethod

/anaconda3/lib/python3.7/site-packages/quandl/connection.py in execute_request(cls, http_verb, url, **options)
     48                                        **options)
     49             if response.status_code < 200 or response.status_code >= 300:
---> 50                 cls.handle_api_error(response)
     51             else:
     52                 return response

/anaconda3/lib/python3.7/site-packages/quandl/connection.py in handle_api_error(cls, resp)
    112         klass = d_klass.get(code_letter, QuandlError)
    113
--> 114         raise klass(message, resp.status_code, resp.text, resp.headers, code)

InvalidRequestError: (Status 422) (Quandl Error QESx04) You have submitted incorrect query parameters. Please check your API call syntax and try again.