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I want to merge two dictionaries into a single dictionary with only common keys between the two.

Here are the two dictionaries

{"a": 5, "b": 8, "d": 9, "z": 4}
{"a": 1, "b": 1, "d": 2, "e": 1}

The result that I want is:

{"a": 6, "b": 9, "d": 11}

Do you guys know any way to do this?

DL_learner
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Aaron Khong
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    What have you tried so far? – Mushif Ali Nawaz Feb 28 '21 at 04:41
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    *"Do you guys know any way to do this?"* - Yes. – superb rain Feb 28 '21 at 04:49
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  • HINT: Find the intersection of both the dictionaries(`d1.keys()&d2.keys()`), then a dictionary comprehension with required logic should do. – Ch3steR Feb 28 '21 at 04:53
  • For everyone being harsh on this question, see [here](https://stackoverflow.com/questions/11011756/is-there-any-pythonic-way-to-combine-two-dicts-adding-values-for-keys-that-appe) for a similar one with identical format (not duplicate), asked by a reputable user, and helpful to many people. – DV82XL Feb 28 '21 at 05:00
  • I've been trying to knacker this question for at least 2 hours off and on now. I initially tried to use the collections module and the counter to try and merge both dictionaries together before my brain just failed. I thank Prune for their suggestions along with others. I'll try to do better in the future and I know just because there are a dozen other questions like my own doesn't mean I get a free pass but I am tired. I'm sorry if I'm trying to take an easy way out and compromising my own journey towards learning programming. – Aaron Khong Feb 28 '21 at 05:25

2 Answers2

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You can try this -

Idea is to find intersections of common keys within both of the dictionaries and sum them up from both

d1.keys() & d2.keys()


d1 = {"a": 5, "b": 8, "d": 9, "z": 4}
d2 = {"a": 1, "b": 1, "d": 2, "e": 1}

result = {key: d1[key] + d2[key] for key in d1.keys() & d2.keys()}

result
{'a': 6, 'd': 11, 'b': 9}
Vaebhav
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First you need to get common keys between two dicts: Lets say you have two dicts d1 and d2

common_keys = list(set(d1.keys()).intersection(set(d2.keys())))
new_dict = {}
for key in common_keys:
    new_dict[key] = d1[key] + d2[key]
CyberPunk
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