replace column values in one dataframe by values of another dataframe

Question

I have two dataframes , the first one has 1000 rows and looks like:

Date            Group         Family       Bonus
2011-06-09      tri23_1       Laavin             


        

Answer 1

You could also create a dictionary and use apply:

hotel_dict = df2.set_index('Group').to_dict()
df1['Group'] = df1['Group'].apply(lambda x: hotel_dict[x])