Question

我必须从Python 3的字典中列出一些元素。

fruits = {
    'apple' : {'price' : '13', weight : '15'},
    'orange' : {'price' : '8', weight : '11'}
}

我该如何列出仅显示所有水果价格的清单？

Answer 1

您可以使用operator.itemgetter如下

from operator import itemgetter

fruits = {'apple' : {'price' : '13', 'weight' : '15'}, 'orange' : {'price' : '8', 'weight' : '11'}}

priceList = list(map(itemgetter('price'), fruits.values()))

print(priceList)

输出：

['13', '8']

Answer 2

这将为您带来：

fruits = {'apple' : {'price' : '13', 'weight' : '15'}, 'orange' : {'price' : '8', 
         'weight' : '11'}}
output = {k:v['price'] for k,v in fruits.items()}
print(output)

结果为：

{'apple': '13', 'orange': '8'}

Answer 3

您可以使用列表推导获取水果价格列表：

fruits = {
    "apple": {"price": "13", "weight": "15"},
    "orange": {"price": "8", "weight": "11"},
}

# using list comprehension
fruits_prices = [fruit_info.get("price") for fruit_info in fruits.values()]

# using loop
fruit_prices = []
for fruit_info in fruits.values():
    fruit_prices.append(fruit_info.get("price"))

print(fruit_prices)

这会给您列出水果价格：

['13', '8']

对初学者的一些帮助

3 个答案: