How to merge/combine columns in pandas?

Question

I have a (example-) dataframe with 4 columns:

data = {\'A\': [\'a\', \'b\', \'c\', \'d\', \'e\', \'f\'],
    \'B\': [42, 52, np.nan, np.nan, np.nan, np.nan],         


        

Answer 1

You can also use ffill with iloc:

df['E'] = df.iloc[:, 1:].ffill(1).iloc[:, -1].astype(int)
df = df.iloc[:, [0, -1]]

print(df)

   A   E
0  a  42
1  b  52
2  c  31
3  d   2
4  e  62
5  f  70