在 div 中提取类在 Python Beautifulsoup 中返回 None

问题描述

下面的代码段并没有真正显示预期的数据，因为它返回 None。任何关于如何正确执行的想法和意见都会非常有帮助。

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

url = "https://bscscan.com/block/9478762"
headers = {"User-Agent": "Mozilla/5.0"}

req = Request(url,headers=headers)
html = urlopen(req).read()
soup = BeautifulSoup(html,"html.parser")

blockheight = soup.find('div',attrs={'class': 'font-weight-sm-bold mr-2'})
print ("Block Height: ",blockheight)

blocktimestamp = soup.find('div',attrs={'class': 'far fa-clock small mr-1'})
print ("Timestamp ",blocktimestamp)

blocktransactions = soup.find('div',class_ = 'u-label u-label--value u-label--primary rounded my-1')
print ("Transactions ",blocktransactions)

电流输出：

    Block Height:   None
    Timestamp:      None
    Transactions:   None

想要的输出：

    Block Height:   9478762
    Timestamp:      Jul-25-2021 11:43:52 PM +UTC
    Transactions:   223 -> transactions https://bscscan.com/txs?block=9478762
                    37 -> contract internal transactions https://bscscan.com/txsInternal?block=9478762
    Validated by:   0xb218c5d6af1f979ac42bc68d98a5a0d796c6ab01

解决方法

我希望这会有所帮助：

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

url = "https://bscscan.com/block/9478762"
headers = {"User-Agent": "Mozilla/5.0"}

req = Request(url,headers=headers)
html = urlopen(req).read()
soup = BeautifulSoup(html,"html.parser")

blockheight = soup.find('span',attrs={'class': 'font-weight-sm-bold mr-2'}).contents[0]
print ("Block Height: ",str(blockheight).replace("\n",""))

blocktimestamp = soup.find('i',attrs={'class': 'far fa-clock small mr-1'}).next_sibling
print ("Timestamp: ",str(blocktimestamp).replace("\n",""))

blocktransactions = soup.find('a',class_ = 'u-label u-label--value u-label--primary rounded my-1').contents[0]
print ("Transactions: ",blocktransactions)

输出：

Block Height:   9478762
Timestamp:  2 hrs 35 mins ago (Jul-25-2021 11:43:52 PM +UTC) 
Transactions:  223 transactions