Pandas数值修改

1、准备数据框

df = pd.DataFrame(
    {
        'country':['China','USA','Japan']
        ,'People':[14.33,3.29,1.26]
    }
    ,index=list('abc')
)

	country	People
a	China	14.33
b	USA	3.29
c	Japan	1.26

2、选择行

idx = df['country']=='USA'

a    False
b     True
c    False
Name: country, dtype: bool

type(idx)

pandas.core.series.Series

3、修改列

df.loc[idx ,'People'] +=1

	country	People
a	China	14.33
b	USA	4.29
c	Japan	1.26