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}