如何在字典中添加单个键的值

Question

假设我有一本字典：

a_dictionary = {"a": [1, 2], "b": [3, 4]}

我想得到一个结果字典，其值为：

a_dictionary = {"a": [3], "b": [7]}

有人可以帮我吗？

Answer 1

试试这个：

for k,v in a_dictionary.items():
    a_dictionary[k] = [sum(v)]

输出：

>>> print(a_dictionary)
{'a': [3], 'b': [7]}

How to add values of a single key in a dictionary