Python--DataFrame分组-GroupBy

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分组统计 ???? GroupBy

 

# *.groupby(by=None,axis=0,level=None,as_index=True,sort=True,group_keys=True,squeeze=False,observed=False,**kwargs)
# axis=0 行  / 1 列

 

有这样一组数据 : 

df = pd.DataFrame({
    'key1':['a','a','b','b','a'],
    'key2':['one','two','one','two','three'],
    'data1':np.random.randn(5),
    'data2':np.random.randn(5)
})

#-------------------------------#
    key1    key2    data1    data2
0    a    one    -0.205263    1.820120
1    a    two    0.436864    -1.858459
2    b    one    0.695624    1.134222
3    b    two    0.281301    1.735320
4    a    three    1.040519    0.657742

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