how to join pandas dataframes code example

Example 1: 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 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: join tables pandas

In [99]: result = left.join(right, on=['key1', 'key2'], how='inner')

Example 4: joins in pandas

pd.merge(product,customer,on='Product_ID')