from requests_html import HTMLSession
from sys import argv
DEBUG = True

USAGE = '''
USAGE:
python html_assertion.py www.itest.info .thumbnail-img 4
'''

if len(argv) != 4:
 print(USAGE)
 exit(1)

script_name, url, css_selector, length = argv

if url[:4] != 'http':
 url = 'http://' + url

session = HTMLSession()
r = session.get(url)

elements = r.html.find(css_selector)


def debug():
 if DEBUG:
  print('*' * 100)
  print(f"css选择器: {css_selector}, 共找到{len(elements)}个元素\n")
  for element in elements:
   print(element.html)
   print(element.attrs)
   print()


if len(elements) != int(length):
 print(f"失败! 预期{length}个元素，实际存在{len(elements)}个元素\n")
 debug()
 exit(1)
else:
 print(f"成功!\n")
 debug()

# 失败情况
python html_assertion.py www.itest.info .thumbnail-img 1
失败! 预期1个元素，实际存在4个元素

****************************************************************************************************
css选择器: .thumbnail-img, 共找到4个元素

<div class="thumbnail-img"><div class="overflow-hidden"><img class="img-responsive" src="/UploadFiles/2021-04-08/mission_impossible_cut.jpg">

动手时间

  
抄一遍代码，看自己能不能运行起来
  
给这段代码每一行都加上注释，理解代码做了些什么

  

扩展阅读
https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors
源码地址


github地址
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