how to add the sum of multiple columns into another column in a dataframe
print(df)
Apples Bananas Grapes Kiwis
0 2.0 3.0 NaN 1.0
1 1.0 3.0 7.0 NaN
2 NaN NaN 2.0 3.0
df['Fruit Total']=df.iloc[:,-4:].sum(axis=1)
print(df)
Apples Bananas Grapes Kiwis Fruit Total
0 2.0 3.0 NaN 1.0 6.0
1 1.0 3.0 7.0 NaN 11.0
2 NaN NaN 2.0 3.0 5.0add multiple columns to dataframe if not exist pandas
cols = ['B','C','D']
df = df.reindex(df.columns.union(cols, sort=False), axis=1, fill_value=0)
print (df)
A B C D
0 1 2 3 0
1 4 4 5 0
2 1 2 3 0
3 4 4 6 0Copyright © 2021 Codeinu
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