使用 BeautifulSoup 从网页下载多个 csv 文件

Question

我正在尝试从此链接下载以特定字符“VX.csv”结尾的 csv 文件：

https://www.cboe.com/products/futures/market-data/historical-data-archive

这是我改编自另一个类似问题的代码：

# Import Key Modules

from bs4 import BeautifulSoup
import requests
import urllib.request


url = 'https://www.cboe.com/products/futures/market-data/historical-data-archive'

def scraper(url):
    html = urllib.request.urlopen(url).read() 
    soup = BeautifulSoup(html)
    # Retrieve all of the anchor tags
    tags = soup('a')
    for tag in tags:
        href = (tag.get('href', None))
        if href.endswith("VX.csv"):
            csv_url = urlparse.urljoin(url, href)
            # ... do something with the csv file....
            contents = urllib.urlopen(csv_url).read()
            print("csv file size=", len(contents))
            break   # we only needed this one file, so we end the loop.

scraper(url)

我给了我以下错误：

AttributeError: 'NoneType' object has no attribute 'endswith'

我不确定我哪里出错了。有人有线索吗？

Answer 1

import requests
from bs4 import BeautifulSoup


def main(url):
    with requests.Session() as req:
        r = req.get(url)
        soup = BeautifulSoup(r.content, 'html.parser')
        target = [f"{url[:20]}{item['href']}" for item in soup.select(
            "a[href$='VX.csv']")]
        for x in target:
            print(f"Downloading {x}")
            r = req.get(x)
            name = x.rsplit("/", 1)[-1]
            with open(name, 'wb') as f:
                f.write(r.content)


main("https://www.cboe.com/products/futures/market-data/historical-data-archive")

输出：

CFE_F05_VX.csv  CFE_G09_VX.csv  CFE_H13_VX.csv  CFE_J18_VX.csv  CFE_M06_VX.csv  CFE_N10_VX.csv  CFE_Q13_VX.csv  CFE_U17_VX.csv  CFE_X05_VX.csv  CFE_Z09_VX.csv
CFE_F06_VX.csv  CFE_G10_VX.csv  CFE_H14_VX.csv  CFE_K04_VX.csv  CFE_M07_VX.csv  CFE_N11_VX.csv  CFE_Q14_VX.csv  CFE_U18_VX.csv  CFE_X06_VX.csv  CFE_Z10_VX.csv
CFE_F07_VX.csv  CFE_G11_VX.csv  CFE_H15_VX.csv  CFE_K05_VX.csv  CFE_M08_VX.csv  CFE_N12_VX.csv  CFE_Q15_VX.csv  CFE_V04_VX.csv  CFE_X07_VX.csv  CFE_Z11_VX.csv
CFE_F08_VX.csv  CFE_G12_VX.csv  CFE_H16_VX.csv  CFE_K06_VX.csv  CFE_M09_VX.csv  CFE_N13_VX.csv  CFE_Q16_VX.csv  CFE_V05_VX.csv  CFE_X08_VX.csv  CFE_Z12_VX.csv
CFE_F09_VX.csv  CFE_G13_VX.csv  CFE_H17_VX.csv  CFE_K07_VX.csv  CFE_M10_VX.csv  CFE_N14_VX.csv  CFE_Q17_VX.csv  CFE_V06_VX.csv  CFE_X09_VX.csv  CFE_Z13_VX.csv
CFE_F10_VX.csv  CFE_G14_VX.csv  CFE_H18_VX.csv  CFE_K08_VX.csv  CFE_M11_VX.csv  CFE_N15_VX.csv  CFE_Q18_VX.csv  CFE_V07_VX.csv  CFE_X10_VX.csv  CFE_Z14_VX.csv
CFE_F11_VX.csv  CFE_G15_VX.csv  CFE_J06_VX.csv  CFE_K09_VX.csv  CFE_M12_VX.csv  CFE_N16_VX.csv  CFE_U04_VX.csv  CFE_V08_VX.csv  CFE_X11_VX.csv  CFE_Z15_VX.csv
CFE_F12_VX.csv  CFE_G16_VX.csv  CFE_J07_VX.csv  CFE_K10_VX.csv  CFE_M13_VX.csv  CFE_N17_VX.csv  CFE_U06_VX.csv  CFE_V09_VX.csv  CFE_X12_VX.csv  CFE_Z16_VX.csv
CFE_F13_VX.csv  CFE_G17_VX.csv  CFE_J08_VX.csv  CFE_K11_VX.csv  CFE_M14_VX.csv  CFE_N18_VX.csv  CFE_U07_VX.csv  CFE_V10_VX.csv  CFE_X13_VX.csv  CFE_Z17_VX.csv
CFE_F14_VX.csv  CFE_G18_VX.csv  CFE_J09_VX.csv  CFE_K12_VX.csv  CFE_M15_VX.csv  CFE_Q04_VX.csv  CFE_U08_VX.csv  CFE_V11_VX.csv  CFE_X14_VX.csv  
CFE_F15_VX.csv  CFE_H05_VX.csv  CFE_J10_VX.csv  CFE_K13_VX.csv  CFE_M16_VX.csv  CFE_Q05_VX.csv  CFE_U09_VX.csv  CFE_V12_VX.csv  CFE_X15_VX.csv
CFE_F16_VX.csv  CFE_H06_VX.csv  CFE_J11_VX.csv  CFE_K14_VX.csv  CFE_M17_VX.csv  CFE_Q06_VX.csv  CFE_U10_VX.csv  CFE_V13_VX.csv  CFE_X16_VX.csv
CFE_F17_VX.csv  CFE_H07_VX.csv  CFE_J12_VX.csv  CFE_K15_VX.csv  CFE_M18_VX.csv  CFE_Q07_VX.csv  CFE_U11_VX.csv  CFE_V14_VX.csv  CFE_X17_VX.csv
CFE_F18_VX.csv  CFE_H08_VX.csv  CFE_J13_VX.csv  CFE_K16_VX.csv  CFE_N04_VX.csv  CFE_Q08_VX.csv  CFE_U12_VX.csv  CFE_V15_VX.csv  CFE_X18_VX.csv
CFE_G05_VX.csv  CFE_H09_VX.csv  CFE_J14_VX.csv  CFE_K17_VX.csv  CFE_N06_VX.csv  CFE_Q09_VX.csv  CFE_U13_VX.csv  CFE_V16_VX.csv  CFE_Z05_VX.csv
CFE_G06_VX.csv  CFE_H10_VX.csv  CFE_J15_VX.csv  CFE_K18_VX.csv  CFE_N07_VX.csv  CFE_Q10_VX.csv  CFE_U14_VX.csv  CFE_V17_VX.csv  CFE_Z06_VX.csv
CFE_G07_VX.csv  CFE_H11_VX.csv  CFE_J16_VX.csv  CFE_M04_VX.csv  CFE_N08_VX.csv  CFE_Q11_VX.csv  CFE_U15_VX.csv  CFE_V18_VX.csv  CFE_Z07_VX.csv
CFE_G08_VX.csv  CFE_H12_VX.csv  CFE_J17_VX.csv  CFE_M05_VX.csv  CFE_N09_VX.csv  CFE_Q12_VX.csv  CFE_U16_VX.csv  CFE_X04_VX.csv  CFE_Z08_VX.csv