运行结果是这样：（求解释错误~~）

Traceback (most recent call last):

  File "E:\LJN-eclipse\eclipse-jee-neon-3-win32-x86_64\eclipse\Workplace\imooc\baike_spider\spider_main.py", line 7, in <module>

    from baike_spider import url_manager, html_downloader, html_parser,\

  File "E:\LJN-eclipse\eclipse-jee-neon-3-win32-x86_64\eclipse\Workplace\imooc\baike_spider\html_parser.py", line 7, in <module>

    from bs4 import BeautifulSoup

  File "C:\Users\刘锦能\AppData\Local\Programs\Python\Python36\lib\bs4\__init__.py", line 29, in <module>

    from .builder import builder_registry

  File "C:\Users\刘锦能\AppData\Local\Programs\Python\Python36\lib\bs4\builder\__init__.py", line 4, in <module>

    from bs4.element import (

  File "C:\Users\刘锦能\AppData\Local\Programs\Python\Python36\lib\bs4\element.py", line 5, in <module>

    from bs4.dammit import EntitySubstitution

  File "C:\Users\刘锦能\AppData\Local\Programs\Python\Python36\lib\bs4\dammit.py", line 11, in <module>

    from htmlentitydefs import codepoint2name

ModuleNotFoundError: No module named 'htmlentitydefs'