use the index to join df python code example

Example 1: union df pandas

pd.concat([df1, df2])

Example 2: join on column pandas

# df1 as main df and use the feild from df2 and map it into df1

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

Example 3: joins in pandas

pd.merge(product,customer,left_on='Product_name',right_on='Purchased_Product')