我有两组dataframe数据：
日数据df1
datetime
2008-06-03 24643.0
2008-06-04 24924.0
2008-06-05 24356.0
2008-06-06 24612.0
2008-06-07 24944.0
...
2020-03-24 9595.0
2020-03-25 9730.0
2020-03-26 9900.0
2020-03-27 9865.0
2020-03-28 9740.0
分钟数据df2
datetime
2008-06-02 10:08:00 24643
2008-06-02 10:09:00 24643
2008-06-02 10:10:00 24643
2008-06-02 10:11:00 24643
2008-06-02 10:12:00 24643
...
2020-03-27 14:55:00 9740
2020-03-27 14:56:00 9740
2020-03-27 14:57:00 9740
2020-03-27 14:58:00 9740
2020-03-27 14:59:00 9740
我想处理成:
datetime
2008-06-02 14:55:00 nan
2008-06-02 14:56:00 nan
2008-06-02 14:57:00 nan
2008-06-02 14:58:00 nan
2008-06-02 14:59:00 24643
...
2020-03-27 14:55:00 nan
2020-03-27 14:56:00 nan
2020-03-27 14:57:00 nan
2020-03-27 14:58:00 nan
2020-03-27 14:59:00 9740
请教一下我们该怎么处理
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FROM 112.45.97.*