使用字典列表的净现值函数

Question

对于列表和元组，我可以做同样的事情来查找NPV

cash_flow_list_of_lists = [[1, 200], [4, 500], [7, 1600]]

按上述方法计算并打印现值

NPV=sum([cash_flow/(1.1**year) for year,cash_flow in 
cash_flow_list_of_lists])
print("Present Value = " , (f"{NPV:9,.2f}"))

如何使用字典列表来实现这一点

cash_flow_dictionary = {1: 200, 4: 500, 7: 1600}

按上述方法计算并打印现值

我试过了 净现值=总和（[现金流量字典.values（）]/（现金流量字典中的1.1**cash\u flow\u dictionary.keys（））

但我不知道该怎么做

Answer 1

解决方案如下：

NPVDict = sum([cash_flow/(1.1**year) for year,cash_flow in
cash_flow_dictionary.items()]) # Note items function to iterate over dictionary
print("Present Value = " , (f"{NPVDict:9,.2f}"))

如果有帮助，请告诉我