How to change the columns name from a tuple to string?

Question

I have used pd.pivot_table in pandas dataframe, and the columns names becomes tuples like (\'A1\', \'B1\'), (\'A1\', \'B2\')... and I want them to

Answer 1

You can use df.DataFrame.Index.map for this:

df1.columns.map(lambda t: t[0] + "_" + t[1])