在 Pandas中，drop_duplicates() 提供了删除重复值的功能，这个方法主要帮助我们删除后出现的重复值。例如，某列数据如下：Open： Open1 12 23 删除后变为 34 43 那么以下哪种参数可以帮助我们实现删除先出现的重复值。
- A.df[‘open’].drop_first()
- B.df[‘open].drop_duplicates(keep=’first’)
- C.df[‘open’].drop_duplicates(keep=’last’)
- D.df[‘open’].drop_last()
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