python - 如何仅从值中获取密钥？

Question

我有这本字典：

    a_dict = {"car":5,"laptop":17,"telephone":3,"photo":14}

我想打印具有最高值的键。例如，我想打印出关键的笔记本电脑，因为它的数字最高

到目前为止，我已经尝试过：

    def get_oldest(things):
        new_list = []
        for elements in things:
            new_list.append(things[element])
            new_list.sort()    

现在，我已将列表从最小到最高排序，所以我知道列表中的最后一项具有最高值，但是如何将其与正确的键匹配并打印出来。

标签： python

Answer 1

There is a much easier way:

a_dict = {"car": 5,"laptop": 17,"telephone": 3,"photo": 14}
oldest = max(a_dict, key=a_dict.get)
# "laptop"

This uses max with a key function. You can use max on the plain dict because iterating a dict produces its keys.