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datafram 数据如何多行合并

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  •   silianbo · Nov 27, 2017 via iPhone · 982 views
    This topic created in 3115 days ago, the information mentioned may be changed or developed.
    year name
    0 2012 silianbo
    1 2013 lihua
    2 2015 lihua
    3 2012 lihua

    效果
    year name count
    0 2012 silianbo,lihua 2
    1 2013 lihua 1
    2 2015 lihua 1
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