Question

python自定义函数传嵌套字典出错

all_guests = {'Alice':{'apples':5,'pretzls':12}, 'Bob':{'ham sandwiches':3,'apples':2}, 'Carol':{'cups':3,'apples pies':1}}def total_brought(guests,item): num_brought = 0 for k,v in guests.itmes(): num_brought = num_brought + v.get(item,0) return num_broughtprint('Number of things being brought:')print(' - Apples '+ str(total_brought(all_guests,'apples')))用来打印带来苹果的数量，嵌套的字典怎么传参数才对？

Answer 1

应该是用大括号的 # create a mapping of state to abbreviationstates = { 'Oregon': 'OR', 'Florida': 'FL', 'California': 'CA', 'New York': 'NY', 'Michigan': 'MI'}# create a basic set of states and some cities in themcities = { 'CA': 'San Francisco', 'MI': 'Detroit', 'FL': 'Jacksonville'}