product_list = [ (,), (,), (,) ] shopping_list =[] salary = () salary.isdigit(): salary = (salary) : index,item (product_list): (index,item) user_choice = () user_choice.isdigit(): user_choice = (user_choice) user_choice < (product_list) user_choice >=: p_item = product_list[user_choice] p_item[] <= salary: shopping_list.append(p_item) salary -= p_item[] (% p_item,salary) : () : () user_choice == : () : ()
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原文：http://1403428.blog.51cto.com/1393428/1965767