title: Inserting named rows in dataframe based on a list pandas
body: <p>I have a list (lets call it Y) of names and it's size is (1080,1). I also have a dataframe of size(700,20) ( lets call it X) with the index containing names from the list Y. That is, there is no names in the dataframe that are not contained in Y, but there are names in Y that are not contained in the dataframe. Now what I would like to do is to insert empty rows containing the names in Y that are not already in X. Hence, I would like to add 380 new rows with empty values in all the columns and index values equal to the values of Y not already contained in the dataframe.</p>