爬取新浪财经网http://finance.sina.com.cn/stock/，各股票公司每日公告（爬取股票分析所需语料）
ps.需要requests、lxml、threading、datetime等py模块
运行：python crawlCompanyAnnouncement.py
其实日期和结束日期可以在main方法中修改，[begin,end] 首尾都包括，若结束日期大于当前日期，取当前日期为结束日期。
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