merge two dataframe on one column code example

Example 1: merge two dataframes based on column

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

df_outer

Example 2: pd merge on multiple columns

new_df = pd.merge(A_df, B_df,  how='left', left_on=['A_c1','c2'], right_on = ['B_c1','c2'])

Example 3: merge two dataframes based on column

df_merge_col = pd.merge(df_row, df3, on='id')

df_merge_col

Example 4: python - match two df on a variable with different name

pd.merge(df1, df2, left_on=  ['userid', 'column1'],
                   right_on= ['username', 'column1'], 
                   how = 'left')