具有相同键的两个不同字典的总和值

Question

i am having two dictionaries

first = {'id': 1, 'age': 23}
second = {'id': 4, 'out': 100}

I want output dictionary as

{'id': 5, 'age': 23, 'out':100}

I tried

>>> dict(first.items() + second.items())
{'age': 23, 'id': 4, 'out': 100}

but i am getting id as 4 but i want to it to be 5 .

Answer 1

You want to use collections.Counter :

from collections import Counter

first = Counter({'id': 1, 'age': 23})
second = Counter({'id': 4, 'out': 100})

first_plus_second = first + second
print first_plus_second

Output:

Counter({'out': 100, 'age': 23, 'id': 5})

And if you need the result as a true dict , just use dict(first_plus_second) :

>>> print dict(first_plus_second)
{'age': 23, 'id': 5, 'out': 100}

Answer 2

If you want to add values from the second to the first, you can do it like this:

first = {'id': 1, 'age': 23}
second = {'id': 4, 'out': 100}

for k in second:
    if k in first:
        first[k] += second[k]
    else:
        first[k] = second[k]
print first

The above will output:

{'age': 23, 'id': 5, 'out': 100}

Answer 3

You can simply update the 'id' key afterwards:

result = dict(first.items() + second.items())
result['id'] = first['id'] + second['id']