[英]How to replace each value in pandas data frame with column value?
If I have a Pandas data frame like this: 如果我有这样的Pandas数据框:
0 20 30 40 50
1 5 NaN 3 5 NaN
2 2 3 4 NaN 4
3 6 1 3 1 NaN
How do I replace each value with its column value such that I get a pandas data frame like this: 如何用列值替换每个值,以便得到像这样的pandas数据框:
0 20 30 40 50
1 0 NaN 30 40 NaN
2 0 20 30 NaN 50
3 0 20 30 40 NaN
IIUC using mul
IIUC使用mul
df.notnull().mul(df.columns,1).replace('',np.nan)
0 20 30 40 50
1 0 NaN 30 40 NaN
2 0 20 30 NaN 50
3 0 20 30 40 NaN
Using mask
with np.tile
: 使用np.tile
mask
:
df = df.mask(df.notnull(), np.tile(df.columns, (df.shape[0], 1)))
print(df)
0 20 30 40 50
1 0 NaN 30 40.0 NaN
2 0 20.0 30 NaN 50.0
3 0 20.0 30 40.0 NaN
This assumes your column labels are integers; 假设您的列标签是整数; if not, first use: 如果没有,首先使用:
df.columns = df.columns.astype(int)
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