n different dataframes merge by column key code example

Example 1: how to merge dataframe with different keys

pandas.merge(df1, df2, how='left', left_on=['id_key'], right_on=['fk_key'])

Example 2: pandas merge two columns from different dataframes

#suppose you have two dataframes df1 and df2, and 
#you need to merge them along the column id
df_merge_col = pd.merge(df1, df2, on='id')