Web scraping using Python and Beautiful soup: error “'page' is not defined”

问题

From a betting site, I want to collect the betting rates. After inspecting the page, I noticed that these rates were included into a eventprice class. Following the explanation from here, I thus wrote this code in Python, using Beautifulsoup module:

from bs4 import BeautifulSoup
import urllib.request
import re

url = "http://sports.williamhill.com/bet/fr-fr"

try:
    page = urllib.request.urlopen(url)
except:
    print("An error occured.")

soup = BeautifulSoup(page, 'html.parser')

regex = re.compile('eventprice')
content_lis = soup.find_all('button', attrs={'class': regex})
print(content_lis)

However, I got the following error:

"(...) line 12, in soup = BeautifulSoup(page, 'html.parser') NameError: name 'page' is not defined"

回答1:

If you print the exception details you will see what is happening:

try:
    page = urllib.request.urlopen(url)
except Exception as e:
    print(f"An error occurred: {e}")

Output

An error occurred: HTTP Error 403: Forbidden
Traceback (most recent call last):
  File ".../main.py", line 12, in <module>
    soup = BeautifulSoup(page, 'html.parser')
NameError: name 'page' is not defined

urlopen() is raising an Exception which results in an undefined 'page' variable. In this case it's a 403 which means you may need to add authentication in order to access this URL.

Update:

A 403 response means there is no way to access this URL in the way that you are trying to access it.

https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/403

来源：https://stackoverflow.com/questions/65500904/web-scraping-using-python-and-beautiful-soup-error-page-is-not-defined