datafram 数据如何多行合并

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V2EX 是一个关于分享和探索的地方

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This topic created in 3085 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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