innner join python code example

Example 1: SQL joins in python

This was What I intended
 ID Case NxtCase
 1    A        
 2    C        
 3    E      

This is my desired result

 ID Case NxtCase
 1    A        B
 2    C        D
 3    E        F

Example 2: joins in pandas

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