import pandas as pd data = {'state':['Ohio','Ohio','Merry','Nevaio','Nevada'],
'year':[2000,2001,2002,2001,2002], 'pop':[1.5,1.7,3.6,2.4,2.9] } frame =
pd.Dat...
2018-11-27 23:29
阅读数 2257
