Concat columns name with BOOLEAN condition

Question

folks. How can I concatenate BOOLEAN columns name to a new column on Pandas?

Original dataset

Column01	Column02
TRUE	TRUE
FALSE	TRUE

Desired output

Column01	Column02	CONCATENATED
TRUE	TRUE	Column01, Column02
FALSE	TRUE	Column02

Answer 1

import pandas as pd


def t(x):
    x["CONCATENATED"] = ", ".join([x.index[i]  for i in range(len(x)) if x.values[i] == True])
    return x


df = pd.DataFrame({"Column01": [True, False], "Column02": [True, True]})

print(df.apply(t, axis=1))

OUTPUT:

   Column01  Column02        CONCATENATED
0      True      True  Column01, Column02
1     False      True            Column02