使用beautifulsoup的Python刮取无法正确刮取某些数据行

Question

我正在用python探索web抓取。我有下面的代码片段，但这段代码的问题是提取的某些数据行不正确。这段代码有什么问题

from urllib.request import Request, urlopen
from bs4 import BeautifulSoup

url = 'https://bscscan.com/txsinternal?ps=100&zero=false&valid=all'
req = Request(url, headers={'User-Agent': 'Mozilla/5.0'})
webpage = urlopen(req, timeout=10).read()
soup = BeautifulSoup(webpage, 'html.parser')
rows = soup.findAll('table')[0].findAll('tr')

for row in rows[1:]:
    ttype = (row.find_all('td')[3].text[0:])
    amt = (row.find_all('td')[7].text[0:])
    transamt = str(amt)
    print()
    print ("this is bnbval: ", transamt)
    print ("transactiontype: ", ttype)

样本输出：

trans amt:   Binance: WBNB Token #- wrong data being extracted
transtype:  0x2de500a9a2d01c1d0a0b84341340f92ac0e2e33b9079ef04d2a5be88a4a633d4 #- wrong data being extracted

trans amt:  1 BNB
transtype:  call

trans amt:  1 BNB
transtype:  call

this is bnbval:   Binance: WBNB Token #- wrong data being extracted
transactiontype: 0x1cc224ba17182f8a4a1309cb2aa8fe4d19de51c650c6718e4febe07a51387dce #- wrong data being extracted

trans amt:  1 BNB
transtype:  call

Answer 1

你的代码没有问题。但是页面上的数据有问题

有些行是7列行-您期望的一行，有些行是9列行。那些是9列的行会给出错误的数据

您只需转到页面并检查元素即可查看问题

我可以建议您使用最后一个元素[-1]，而不是[7]。但是你需要对第三栏进行一些if检查