Merging two dictionaries, common key's value get added

Asked Apr 09 '21 at 14:30

Active Apr 09 '21 at 14:40

Viewed 219 times

-1

This was one of the question in my technical test round. what could be best way of solving this:

Merging dictionaries - The resultant dict must contain all items of both dicts. If key is common then the value of key in resultant dict must be the sum of value in a and b.

a = {'x': 1, 'y': 2, 'z': 3}

b = {'a': 4, 'b': 5, 'b': 6}


def dictMerge(a, b):

    #Your code here

asked Apr 09 '21 at 14:30

Ajay Chaurasia

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`answer = {}` and `[answer.setdefault(k, []).append(v) for d in (a,b) for k,v in d.items()]` – inspectorG4dget Apr 09 '21 at 14:32
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`b` is an invalid `dict` the key `'b'` cannot be in twice. – Henry Ecker Apr 09 '21 at 14:37
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Key 'b' could be in both dictionaries, but it can't exist twice in the same one. As it shows in your question currently. – acrobat Apr 09 '21 at 14:38

1 Answers1

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dict b is not valid as some have pointer out. You can use a look to add the values:

a = {'x': 1, 'y': 2, 'z': 3, 'b': 6}

b = {'a': 4, 'b': 5}


def dict_merge(a, b):
    result = a.copy()
    for key, value in b.items():
        result[key] = result.get(key, 0) + value
    return result

print(dict_merge(a, b))

answered Apr 09 '21 at 14:40

miquelvir

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