D:\PycharmProjects\python_Introduction\python_Introduction\code\30\看店宝（京东版）>python.exe show_window.py

libpng warning: iCCP: known incorrect sRGB profile

libpng warning: iCCP: cHRM chunk does not match sRGB

libpng warning: iCCP: known incorrect sRGB profile

Traceback (most recent call last):

  File "show_window.py", line 428, in <module>

    main = Main()

  File "show_window.py", line 44, in __init__

    self.setupUi(self)

  File "D:\PycharmProjects\python_Introduction\python_Introduction\code\30\看店宝（京东版）\window_main.py", line 193, in setupUi

    self.retranslateUi(MainWindow)

  File "D:\PycharmProjects\python_Introduction\python_Introduction\code\30\看店宝（京东版）\window_main.py", line 240, in retranslateUi

    id_str1 = mycrawl.get_rankings(heat_rankings_url)

  File "D:\PycharmProjects\python_Introduction\python_Introduction\code\30\看店宝（京东版）\crawl.py", line 31, in get_rankings

    book_list = html.find('div', {'class', 'm m-list'}).select('li')  # 获取图书所有信息

AttributeError: 'NoneType' object has no attribute 'select'