问题描述
我有一个看起来像这样的字典列表(它是从一个 json 文件创建的)
{"prizes":[{"year":"2020","category":"chemistry","laureates":[{"id":"991","firstname":"emmanuelle","surname":"Charpentier","motivation":"\"for the development of a method for genome editing\"","share":"2"},{"id":"992","firstname":"Jennifer A.","surname":"Doudna","share":"2"}]},{"year":"2020","category":"economics","laureates":[{"id":"995","firstname":"Paul","surname":"Milgrom","motivation":"\"for improvements to auction theory and inventions of new auction formats\"",{"id":"996","firstname":"Robert","surname":"Wilson","category":"literature","laureates":[{"id":"993","firstname":"Louise","surname":"Gl\u00fcck","motivation":"\"for her unmistakable poetic voice that with austere beauty makes individual existence universal\"","share":"1"}]}
etc.
我想要做的是计算每个类别的获奖者数量(知道在某些情况下有 0 个获奖者)
这是我想到的:
def nobel_data():
with open('prize.json',newline='') as jsonfile:
nobel = json.load(jsonfile)
counter = {}
for prize in nobel['prizes']:
cat = prize['category']
try: #'try' enables us to ignore the 'KeyError' with "pass".
laureates = len(prize['laureates'])
except KeyError:
pass
counter[cat] = counter.get(cat,0) + laureates
print(counter)
nobel_data()
但我想看看你们是否可以向我展示一种使用 setdefault 为每个可能的类别(化学、医学等)创建初始键的方法,然后找到每个类别的获奖者的 len
解决方法
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