from pandas import Series, DataFrame

mine   = Series([10, 20, 30], index=['naver', 'sk', 'kt'])
friend = Series([10, 30, 20], index=['kt', 'naver', 'sk'])

merge = mine + friend
print(merge)
from pandas import Series, DataFrame

mine   = Series([10, 20, 30], index=['naver', 'sk', 'kt'])
friend = Series([10, 30, 20], index=['kt', 'naver', 'sk'])

merge = mine + friend
print(merge)