Add values from two dictionaries

Question

dict1 = {a: 5, b: 7}
dict2 = {a: 3, c: 1}

result {a:8, b:7, c:1}

How can I get the result?

Answer 1

A quick dictionary comprehension that should work on any classes which accept the + operator. Performance might not be optimal.

{
    **dict1,
    **{ k:(dict1[k]+v if k in dict1 else v)
        for k,v in dict2.items() }
}