在两列上合并两个数据框

Question

I have 2 dataframes:

dfBB

Rank, Song, Artist, Year

and dfMap

Artist, Song, SongId, ArtistId

I would like to merge them together on the basis of Artist and Song ie: where they match I add the extra columns otherwise 0:

Artist, Song, SongId, ArtistId, Rank, Year

I am foreseeing another problem where the artist or song might be spelled incorrectly. Maybe I can check similarity? Not too sure how to go about it.

For the merging I tried:

merged = pd.merge(dfMap, dfBB, on='Artist' and 'Song', how='outer')

but got:

Artist_x, Song, SongId, ArtistId, Rank, Artist_y, Rank 

Answer 1

merged = pd.merge(dfMap, dfBB, on=['Artist','Song'], how='outer')

You can use a list or array of values to merge two dataframes. I would recommend checking the documentation

With regards to misspellings, you're gonna need to do some cleaning on your own. You may want to check out difflib