python2 里面有没有什么优雅的方法对字典相同的 key 求和

[Zuckonit]

dict_a = {'a' : 1, 'b' : 2}
dict_b = {'a' : 2, 'b' : 3}
如何得到dict_c = {'a': 3, 'b': 5}

[lll9p]

http://stackoverflow.com/questions/3490738/how-to-sum-dict-elements
http://stackoverflow.com/questions/8584504/python-sum-on-keys-for-list-of-dictionaries

[imn1]

class collections.Counter([iterable-or-mapping])

[imn1]

呃，求和，反应成计数了
统计方面的习惯都交给pandas了

[Zuckonit]

@lll9p @imn1 thanks