关于pandas一些warning的解决办法

See the caveats in the documentation: http://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy df_1_level['level1_name'] = df_1_level['department_name'] crawlJDYcontacts.py:113: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from