dataframes join code example

Example 1: pandas left join

df.merge(df2, left_on = "doc_id", right_on = "doc_num", how = "left")

Example 2: joins in pandas

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

Example 3: merge two columns name in one header pandas

df['A'] = df[a_cols].apply(' '.join, axis=1)