Pandas DataFrame(2) - Combine dataframes

Among the following functions, which one uses patching the data method.

• merge()

• concat()

• combine_first()

Among the following functions, which one can be used to combine dataframes when they have similar structure.

• combine_first

• concat()

• merge()

For the concat(), if the axis=1, it will join the dataframes ...............

• vertically

• horizontally

Which among these are correct for combine_first()?

• All its empty values will be retained

• only missing values are copied from other dataframe

• all non-matching rows from other dataframe is copied

While we concat, if we do not want the mechanism for row indexes and want to have new row indexes generated from 0 to n-1, then we can give argument ignore_index as .............

• False

• True

Which function can be used to combine dataframes based on common fields?

• merge()

• combine_first()

• concat()

Which function views dataframe in the form of vertical subset ie column wise?

• iterrows()

• iteritems()

Which of the functions can be used to delete column/row from a DataFrame?

• pop()

• at()

• drop()

• iloc()