How to remove nan value while combining two column in Panda Data frame?

Question

I am trying but not able to remove nan while combining two columns of a DataFrame.

Data is like:

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Answer 1

If you want a solution that doesn't require referencing df twice or any of its columns explicitly:

df.bfill(axis=1).iloc[:, 0]

With two columns, this will copy non-null values from the right column into the left, then select the left column.