我有一个Pandas数据框,其中有两列A和B。我需要一个新的合并列“result”,其中将A优先于B。我真的认为这很容易,但仍然没有解决方案。你们会怎么做呢?谢谢你们的帮助。
A B result
go for go
go go
go go
for for
for for
combine_first
或 fillna
:df['result'] = df['A'].combine_first(df['B'])
print (df)
A B result
0 go for go
1 go NaN go
2 go NaN go
3 NaN for for
4 NaN for for
或者:
df['result'] = df['A'].fillna(df['B'])
print (df)
A B result
0 go for go
1 go NaN go
2 go NaN go
3 NaN for for
4 NaN for for
编辑:
要将空格替换为NaN
,请使用以下方法:
df = df.replace('', np.nan)
或者:
df = df.mask(df == '')