groupby:
import random
import numpy as np
random.seed()
df = pd.DataFrame({'data':['a', 'a', 'b', 'b', 'a'],
'num':['one', 'two', 'one', 'two', 'one'],
'data1':np.random.randn(5),
'data2':np.random.randn(5)})
标签：--,random,two,groupby,np,import,pandas From： https://www.cnblogs.com/yu121/p/17469562.html