Python，從網站中提取 XHR 響應數據

Question

我正在嘗試從https://www.barchart.com/stocks/signals/top-bottom/top?viewName=main中提取一些數據。

我可以使用 xpath 方法從普通 html 中提取數據，但是我注意到該網站從網絡獲取數據。

我找到了我想要的數據的位置（來自 barchart 網站的表格），如下圖所示。

XHR 響應圖片

我怎樣才能只抓取響應部分？

謝謝！

Answer 1

試試這個代碼。

from urllib import urlencode

headers = {
    'cookie': 'XSRF-TOKEN=eyJpdiI6Ikk4cFdwcGlqMVVPRHM4MFc5Vk1ROWc9PSIsInZhbHVlIjoiUHRHbjZwSTZFTUkrTFRNZVJXczZsV2xZZnN1WEhmM1puakN5WWFsM0RUODhJRUZJYVA3XC9GZ1QyOUR5R0VqaXRmdDJIR0wyV2lBdXlFcTlxXC9HWFVqZz09IiwibWFjIjoiNTlkODY2MGM0YzJlZDQxMTI5ZmIwMmE0NWI5YzkzY2Q4NDg3MjhiODg4NDAxN2Q5NmYzYTE3MmUxZWQzZjk4MiJ9; laravel_session=eyJpdiI6ImFob1k3NWw1U2pBcWhKU3JLdEpDQkE9PSIsInZhbHVlIjoidnNNcXpKSHRmQkYyMGp2NTF4eUhTVVwvSmtidnAwMDV5eGdUWWVhZ2syTUlXaVdQV1JEUldYcG5lXC9mdUtnRkl2akNMR2ZKMkY2NFlWYTFOM2NPRm1uQT09IiwibWFjIjoiYTJhODkwMTJjZjI3NzJiOTE1YWY5MWJkYTNiYTNlMjZjNjI1YjgzZmJlYzhkMTU4Mjk1OWQ5MWEzMGU5OTM5NSJ9; _ga=GA1.2.674295962.1536391451; _gid=GA1.2.1388999250.1536391451; _gat_UA-2009749-51=1; Markets09122018PageView=1; Markets09122018WebinarClosed=true',
    'dnt': '1',
    'x-xsrf-token': 'eyJpdiI6Ikk4cFdwcGlqMVVPRHM4MFc5Vk1ROWc9PSIsInZhbHVlIjoiUHRHbjZwSTZFTUkrTFRNZVJXczZsV2xZZnN1WEhmM1puakN5WWFsM0RUODhJRUZJYVA3XC9GZ1QyOUR5R0VqaXRmdDJIR0wyV2lBdXlFcTlxXC9HWFVqZz09IiwibWFjIjoiNTlkODY2MGM0YzJlZDQxMTI5ZmIwMmE0NWI5YzkzY2Q4NDg3MjhiODg4NDAxN2Q5NmYzYTE3MmUxZWQzZjk4MiJ9',
    'accept-language': 'en-US,en;q=0.9',
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.81 Safari/537.36',
    'accept': 'application/json',
    'referer': 'https://www.barchart.com/stocks/signals/top-bottom/top?viewName=main',
    'authority': 'www.barchart.com',
    'accept-encoding': 'gzip, deflate, br',
}

params = (
    'lists': 'stocks.signals.top.current.us',
    'orderDir': 'asc',
    'fields': 'symbol,symbolName,lastPrice,priceChange,percentChange,opinion,opinionPrevious,opinionLastWeek,opinionLastMonth,symbolCode,symbolType,hasOptions',
    'meta': 'field.shortName,field.type,field.description',
    'hasOptions': 'true',
    'page': '1',
    'limit': '100',
    'raw': '1',
)

yield Request('https://www.barchart.com/proxies/core-api/v1/quotes/get?' + urlencode(params) , headers=headers)