Created
October 28, 2017 06:26
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| data=pd.DataFrame([[2010,'auto'],[2010,'haha'],[2011,'haha'],[2012,'md']],columns=['year','type']) | |
| data['typecnt']=np.ones(data.shape[0]) | |
| data.groupby(['year','type'])['typecnt'].count() | |
| 输出 | |
| year type | |
| 2010 auto 1 | |
| haha 1 | |
| 2011 haha 1 | |
| 2012 md 1 | |
| Name: typecnt, dtype: int64 |
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