Why does Pandas inner join give ValueError: len(left_on) must equal the number of levels in the index of “right”?

Question

I\'m trying to inner join DataFrame A to DataFrame B and am running into an error.

Here\'s my join statement:

merged = DataFrameA.join(DataFrameB, on=[\'         


        

Answer 1

Here is another way of performing join. Unlike the answer verified, this is a more general answer applicable to all other types of join.

Inner Join

inner join can also be performed by explicitly mentioning it as follows in how:

pd.merge(df1, df2, on='filename', how='inner')

The same methodology aplies for the other types of join:

OuterJoin

pd.merge(df1, df2, on='filename', how='outer')

Left Join

pd.merge(df1, df2, on='filename', how='left')

Right Join

pd.merge(df1, df2, on='filename', how='right')