pandas 之 DataFrame筛选数据

import pandas as pd
import numpy as np
df = pd.DataFrame(np.random.randn(6, 4), columns=list('abcd'))
df

        a	        b	        c	        d
0	-0.026429	-1.957159	1.365762	0.799437
1	-0.115957	1.386499	-0.760147	0.579012
2	0.572344	1.551177	1.249986	-1.579039
3	1.976746	0.443745	0.284829	0.198566
4	1.359592	1.155362	0.419426	-0.781024
5	0.532487	-1.206691	-1.895836	-0.604478

• 单条件筛选

df[df.d > 0]

	a	       b	        c	        d
0	-0.026429	-1.957159	1.365762	0.799437
1	-0.115957	1.386499	-0.760147	0.579012
3	1.976746	0.443745	0.284829	0.198566

• 多条件筛选

df[(df.d>0)&(df.c<0)]

	a	        b	        c	        d
1	-0.115957	1.386499    	-0.760147	0.579012

df[['a','b']][(df.d > 0)|(df.c < 0)]

	a	        b
0	-0.026429	-1.957159
1	-0.115957	1.386499
3	1.976746	0.443745
5	0.532487	-1.206691