pandas join dataframe

1# df1 as main df and use the feild from df2 and map it into df1
2
3df1.merge(df2,on='columnName',how='left')

1In [99]: result = left.join(right, on=['key1', 'key2'], how='inner')
2

1pd.merge(product,customer,how='inner',left_on=['Product_ID','Seller_City'],right_on=['Product_ID','City'])

1>>> df.join(other.set_index('key'), on='key')
2  key   A    B
30  K0  A0   B0
41  K1  A1   B1
52  K2  A2   B2
63  K3  A3  NaN
74  K4  A4  NaN
85  K5  A5  NaN
9

1In [88]: result = left.join(right, how='inner')
2

1#https://pandas.pydata.org/docs/user_guide/merging.html