首先新建一个dataframe： In[8]: df = pd.DataFrame({'name':list('ABCDA'),'house':[1,1,2,3,3],'date':['2010-01-01','2010-06-09','2011-12-03','2011-04-05','2012-03-23']}) In[9]: df Out[9]: date house name 0 2010-01-01 1 A 1 2010-06-09 1 B 2 2011-12-03 2