JSONDecodeError：期望值：TD Ameritrade API中的第2行第11列（字符11）

Question

我对api和python还是很陌生，只知道一点点代码，但是我试图从Td Ameritrade Api提取股票数据。 我已经按照几个youtube视频获取了此代码以及它们的工作方式，但是当我运行它时，出现了一个错误：完整错误在下面。如果有人知道如何解决这个问题，将不胜感激。

endpoint = r"https://api.tdameritrade.com/v1/marketdata/{}/pricehistory".format('GOOG')

payload = {'apikey': apikey,
           'periodType': 'day',
           'frequencyType' : 'minute',
           'frequency' : '1',
           'period' : '2',
           'needExtendedHourData' : 'true'}

content = requests.get(url = endpoint, params = payload)
print()

data = content.json()

print(data)

---

JSONDecodeError                           Traceback (most recent call last)
<ipython-input-102-6604869a0d57> in <module>
     10 content = requests.get(url = endpoint, params = payload)
     11 
---> 12 data = content.json()
     13 
     14 print(data)

c:\users\steve\appdata\local\programs\python\python37\lib\site-packages\requests\models.py in json(self, **kwargs)
    888                 try:
    889                     return complexjson.loads(
--> 890                         self.content.decode(encoding), **kwargs
    891                     )
    892                 except UnicodeDecodeError:

c:\users\steve\appdata\local\programs\python\python37\lib\json\__init__.py in loads(s, encoding, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
    346             parse_int is None and parse_float is None and
    347             parse_constant is None and object_pairs_hook is None and not kw):
--> 348         return _default_decoder.decode(s)
    349     if cls is None:
    350         cls = JSONDecoder

c:\users\steve\appdata\local\programs\python\python37\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):

c:\users\steve\appdata\local\programs\python\python37\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 2 column 11 (char 11)