PythonCrawler

Description

A crawler for http://baike.baidu.com/

1. This is the learning outcome for online course: http://www.imooc.com/learn/563
2. Added some changes to improve the original version:    - Add timeout to ensure the completion of the program
   • Modified regular expression to get more accuracy matching results
   • Use queue to get ordered results
   • Adapt to multi-version Python