[Error]Expecting value: line 1 column 1 (char 0)

amzn_df = fdr.DataReader('AMZN', '2018','2020')
amzn_df

---------------------------------------------------------------------------
JSONDecodeError                           Traceback (most recent call last)
C:\Users\Public\Documents\ESTsoft\CreatorTemp/ipykernel_9328/2668210119.py in <module>
----> 1 amzn_df = fdr.DataReader('AMZN', '2018','2020')
      2 amzn_df

~\anaconda3\lib\site-packages\FinanceDataReader\data.py in DataReader(symbol, start, end, exchange, data_source)
     39     # Investing
     40     reader = InvestingDailyReader
---> 41     df = reader(symbol, start, end, exchange, data_source).read()
     42     end = min([pd.to_datetime(end), datetime.today()])
     43     while len(df) and df.index[-1] < end: # issues/30

~\anaconda3\lib\site-packages\FinanceDataReader\investing\data.py in read(self)
     60         start_date_str = self.start.strftime('%m/%d/%Y')
     61         end_date_str = self.end.strftime('%m/%d/%Y')
---> 62         curr_id = self._get_currid_investing(self.symbol, self.exchange, self.data_source)
     63         if not curr_id:
     64             raise ValueError("Symbol unsupported or not found")

~\anaconda3\lib\site-packages\FinanceDataReader\investing\data.py in _get_currid_investing(self, symbol, exchange, data_source)
     28         }
     29         r = requests.post(url, data={'search_text': symbol}, headers=headers)
---> 30         jo = json.loads(r.text)
     31         if len(jo['quotes']) == 0:
     32             raise ValueError(f"Symbol('{symbol}') not found")

~\anaconda3\lib\json\__init__.py in loads(s, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
    344             parse_int is None and parse_float is None and
    345             parse_constant is None and object_pairs_hook is None and not kw):
--> 346         return _default_decoder.decode(s)
    347     if cls is None:
    348         cls = JSONDecoder

~\anaconda3\lib\json\decoder.py in decode(self, s, _w)
    335 
    336         """
--> 337         obj, end = self.raw_decode(s, idx=_w(s, 0).end())
    338         end = _w(s, end).end()
    339         if end != len(s):

~\anaconda3\lib\json\decoder.py in raw_decode(self, s, idx)
    353             obj, end = self.scan_once(s, idx)
    354         except StopIteration as err:
--> 355             raise JSONDecodeError("Expecting value", s, err.value) from None
    356         return obj, end

JSONDecodeError: Expecting value: line 1 column 1 (char 0)

FinanceDataReader 를 이용하던 중 디코더 오류가 발생

Why?

크롤링이나 API 관련 코드들은 Target 사이트의 정보가 바뀔때 유지보수할 필요가 있다.

해결

https://github.com/FinanceData/FinanceDataReader/wiki/

pip install -U finance-datareader