Question

What does the `df.[["Col1","Col2"]]` instruction do with `df` a DataFrame type object?

Accepted Answer

Access the values of the two columns```Col1``` and```Col2```

Answer

This statement returns the indexes of the rows that have null values for one of the two columns ```Col1``` and ```Col2```

Answer

This statement returns the indexes of rows that have zero values simultaneously for both columns ```Col1 and Col2```

Answer

Add the two new columns```Col1``` and ```Col2``` in the DataFrame ```df```

Question from the Python Machine Learning test