按照教程写完了，但是运行出错，Traceback (most recent call last):

Question

Traceback (most recent call last): =========》第一个问题  File "/Users/sherry/Downloads/baike_spider-master/baike_spider/sider_main.py", line 2, in <module>    from baike_spider import html_downloader, html_parser, html_outputer,\  File "/Users/sherry/Downloads/baike_spider-master/baike_spider/html_parser.py", line 2, in <module>    from bs4 import BeautifulSoupImportError: No module named bs4ImportError: No module named bs4 ============》 第二个问题：明明下载了bs4xunie-Mac:~ sherry$ pip install BeautifulSoup4Requirement already satisfied: BeautifulSoup4 in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages