Sum values in a dict of lists

Question

If I have a dictionary such as:

my_dict = {\"A\": [1, 2, 3], \"B\": [9, -4, 2], \"C\": [3, 99, 1]}

How do I create a new dictionary with su

Answer 1

Use sum() function:

my_dict = {"A": [1, 2, 3], "B": [9, -4, 2], "C": [3, 99, 1]}

result = {}
for k, v in my_dict.items():
    result[k] = sum(v)

print(result)

Or just create a dict with a dictionary comprehension:

result = {k: sum(v) for k, v in my_dict.items()}

Output:

{'A': 6, 'B': 7, 'C': 103}