import re

from bs4 import BeautifulSoup

from urllib.request import urlopen

url = "你要解析的网页URL"

html = urlopen(url).read()

soup = BeautifulSoup(html,"html.parser")

titles = soup.select("body  script") # CSS 选择器

i = 1

for title in titles:

    if i == 3:

     #print(title.get_text())# 标签体、标签属性

     str=title.get_text()

     break

    if i == 2:

        i = 3

    if i == 1:

        i = 2

print(str)

str1 = "\"\"\""+"<script>"+str+"</script>"+"\"\"\""

soup = BeautifulSoup(str1, "html.parser")

pattern = re.compile(r"var _url = '(.*?)';$", re.MULTILINE | re.DOTALL)

script = soup.find("script", text=pattern)

#print (pattern.search(script.text).string)

s = pattern.search(script.text).string

print (s.split('\'')[11])