随机获取 json.decoder.JSONDecodeError

Question

我已经实现了这个答案给出的功能：https://quant.stackexchange.com/a/70155/33457

当我运行此代码时，有时它运行良好，但大多数时候它会返回此错误：

raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

有趣的是，它是否经历或返回这个错误似乎是完全随机的？这是为什么？

我试图找出我的

headers

是否有问题，但我不知道

在这里查看我的完整代码；

import requests

def get_symbol_for_isin(isin):
    url = 'https://query1.finance.yahoo.com/v1/finance/search'

    headers = {
        'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.109 Safari/537.36',
    }

    params = dict(
        q=isin,
        quotesCount=1,
        newsCount=0,
        listsCount=0,
        quotesQueryId='tss_match_phrase_query'
    )

    resp = requests.get(url=url, headers=headers, params=params)
    data = resp.json()
    if 'quotes' in data and len(data['quotes']) > 0:
        return data['quotes'][0]['symbol']
    else:
        return None

apple_isin = 'US0378331005'
print(get_symbol_for_isin(apple_isin))

返回应为“AAPL”

Answer 1

您应该检查回复的

status_code

。如果服务器返回 4xx 错误，它可能不是 JSON。

def get_symbol_for_isin(isin):
    url = 'https://query1.finance.yahoo.com/v1/finance/search'

    headers = {
        'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.109 Safari/537.36',
    }

    params = dict(
        q=isin,
        quotesCount=1,
        newsCount=0,
        listsCount=0,
        quotesQueryId='tss_match_phrase_query'
    )

    resp = requests.get(url=url, headers=headers, params=params)
    if resp.status_code != 200:
        return resp.reason
    data = resp.json()
    if 'quotes' in data and len(data['quotes']) > 0:
        return data['quotes'][0]['symbol']
    else:
        return None