Question

How to merge two dictionaries and sum the values in Python

Answer 1

dict1 = {'a': 4, 'b': 3, 'c': 7, 'd': 9, 'e': 100}
dict2 = {'a': 1, 'b': 5, 'c': 2, 'f': 12, 'g': 50}

result = {key: dict1.get(key, 0) + dict2.get(key, 0) for key in dict1}

print(result)





'''
run:

{'a': 5, 'b': 8, 'c': 9, 'd': 9, 'e': 100}

'''

 

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Answer 2

dict1 = {'a': 4, 'b': 3, 'c': 7, 'd': 9, 'e': 100}
dict2 = {'a': 1, 'b': 5, 'c': 2, 'f': 12, 'g': 50}

result = {key: dict1.get(key, 0) + dict2.get(key, 0) for key in set(dict1) & set(dict2)}

print(result)





'''
run:

{'c': 9, 'b': 8, 'a': 5}

'''

 

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Answer 3

dict1 = {'a': 4, 'b': 3, 'c': 7, 'd': 9, 'e': 100}
dict2 = {'a': 1, 'b': 5, 'c': 2, 'f': 12, 'g': 50}

result = {key: dict1.get(key, 0) + dict2.get(key, 0) for key in dict2}

print(result)





'''
run:

{'a': 5, 'b': 8, 'c': 9, 'f': 12, 'g': 50}

'''

 

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Answer 4

dict1 = {'a': 4, 'b': 3, 'c': 7, 'd': 9, 'e': 100}
dict2 = {'a': 1, 'b': 5, 'c': 2, 'f': 12, 'g': 50}

result = {key: dict1.get(key, 0) + dict2.get(key, 0) for key in set(dict1) | set(dict2)}

print(result)





'''
run:

{'g': 50, 'f': 12, 'c': 9, 'd': 9, 'b': 8, 'e': 100, 'a': 5}

'''

 

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