在字典中迭代列表

Question

我是Python的新手，我希望在字典中的列表中迭代字典（我知道令人困惑）。my_dict = {"John": [{"class": "math", "score": 100, "year": 2014}, {"class": "english", "score": 85, "year": 2015}], "Timmy": [{"class": "math", "score": 87, "year": 2014}, {"class": "english", "score": 91, "year": 2015}], "Sally":[{"class": "math", "score": 95, "year": 2014}]}我需要创建一个关于学生姓名及其综合分数的新字典（Sally只有一个分数）。输出将如下所示：new_dict = {"John": 185, "Timmy": 178, "Sally": 95}任何帮助或指导将不胜感激！

Answer 1

使用字典理解：

{k: sum(x['score'] for x in v) for k, v in my_dict.items()}

验证码：

my_dict = {"John": [{"class": "math", "score": 100, "year": 2014}, {"class": "english", "score": 85, "year": 2015}], 

"Timmy": [{"class": "math", "score": 87, "year": 2014}, {"class": "english", "score": 91, "year": 2015}], 

"Sally":[{"class": "math", "score": 95, "year": 2014}]}

new_dict = {k: sum(x['score'] for x in v) for k, v in my_dict.items()}

# {'John': 185, 'Timmy': 178, 'Sally': 95}

Answer 2

我试图编写一个程序来解决这种情况。

score_dict = {}

for name in my_dict:

    score_dict[name] = 0

    class_items = my_dict[name]

    for class_item in class_items:

        score_dict[name] += class_item['score']

print score_dict