map、filter與lambda表達式

如下，每個小字典的name對應股票名字，shares對應多少股，price對應股票的價格
portfolio = [
    {‘name’: ‘IBM’, ‘shares’: 100, ‘price’: 91.1},
    {‘name’: ‘AAPL’, ‘shares’: 50, ‘price’: 543.22},
    {‘name’: ‘FB’, ‘shares’: 200, ‘price’: 21.09},
    {‘name’: ‘HPQ’, ‘shares’: 35, ‘price’: 31.75},
    {‘name’: ‘YHOO’, ‘shares’: 45, ‘price’: 16.35},
    {‘name’: ‘ACME’, ‘shares’: 75, ‘price’: 115.65}
]
1.通過哪個內置函數可以計算購買每支股票的總價

print(list(map(lambda dic: {dic['name']: round(dic['shares'] * dic['price'])}, portfolio)))

 

2.用filter過濾出，單價大於100的股票有哪些？

 f= filter(lambda x:x['price'] > 100,portfolio)
print(list(f))