<human>:  Joining pandas dataframes by column names
<bot>: Here is some code to join pandas data frame `frame_1` and `frame_2` with left join by `county_ID` and right join by `countyid`

pd.merge(frame_1, frame_2, left_on='county_ID', right_on='countyid')

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