human
Merging two pandas dataframes
assistant
Here is some code to create new DataFrame object by merging columns "key" of  dataframes `split_df` and `csv_df` and rename the columns from dataframes `split_df` and `csv_df` with suffix `_left` and `_right` respectively

pd.merge(split_df, csv_df, on=['key'], suffixes=('_left', '_right'))

#Warning: this code generation is experimental. Please inspect the code for any bugs before executing.