import urllib

import urllib3

import os

from bs4 import BeautifulSoup

html = urllib.request.urlopen('https://coding.imooc.com/?mc_marking=5931f8e07e353edf2b94a098f44a062c&mc_channel=bdqdkj"').read()

BeautifulSoup(html,'html.parser',from_encoding='utf-8')

images = soup.findAll('img')

print(images)

NameError                                 Traceback (most recent call last)<ipython-input-7-66dd4a9403a2> in <module>()      7 html = urllib.request.urlopen('https://coding.imooc.com/?mc_marking=5931f8e07e353edf2b94a098f44a062c&mc_channel=bdqdkj"').read()      8 BeautifulSoup(html,'html.parser',from_encoding='utf-8')----> 9 images = soup.findAll('img')     10 print(images)NameError: name 'soup' is not defined

报这样的错误为什么呀？