[英]Pandas Multiindex: convert Multiindex to a column and keep the first level hidden or as nan
Here is my dataframe of Multiindex:这是我的 Multiindex 数据框:
data3 = [['a', 'b',3,3],['a','c',3,3],['b','c',3,3],['c','d',3,3]]
df3 = pd.DataFrame(data3, columns=['v3a','v3b','v3c','v3d'])
df3 = df3.groupby(['v3a','v3b']).first()
How to convert Multiindex to a column and keep the first level hidden or as nan as following:如何将 Multiindex 转换为列并保持第一级隐藏或 nan 如下:
To have NaN
:拥有NaN
:
import numpy as np
df3 = df3.groupby(['v3a','v3b']).first().reset_index()
df3.loc[df3['v3a'].duplicated(), 'v3a'] = np.nan
print(df3)
v3a v3b v3c v3d
0 a b 3 3
1 NaN c 3 3
2 b c 3 3
3 c d 3 3
If you mean "hidden" as in "empty string" you can do:如果您在“空字符串”中表示“隐藏”,您可以执行以下操作:
df3 = df3.groupby(['v3a','v3b']).first().reset_index()
df3.loc[df3['v3a'].duplicated(), 'v3a'] = ''
print(df3)
v3a v3b v3c v3d
0 a b 3 3
1 c 3 3
2 b c 3 3
3 c d 3 3
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