需要对不确定长度的字典和不确定个数的字典做相加操作，相同的key的value相加，
from collections import OrderedDict,Counter
dict1 = {1:2,3:4}
dict2 = {1:2,3:4,8：90}
dict3 = {1:2,3:4,8:9,10:89}
result = Counter({})
dict_list = [dict1,dict2,dict3]#这里字典随便搞
for dicts in dict_list:
result= result +Counter(dicts)
last_result = dict(result)
基于类的实现
class AddTest(object):
'''两个字典相加的类，返回一个字典'''
def __init__(self,a):
self.a=a
assert isinstance(a,dict)
def __str__(self):
return self.a
def __add__(self, other):
for i in self.a.keys():
if other.a.get(i):
self.a[i] = self.a.get(i) +other.a.get(i)
for i in other.a.keys():
if not self.a.get(i):
self.a[i] = other.a.get(i)
return self.a
__repr__ = __str__
a={"a":1,"b":2,"d":10}
b={"c":1,"a":2,"d":5}
c = AddTest(a)+AddTest(b)
print c,type(c)
或者
a={"a":1,"b":2,"d":10}
b={"e":1,"f":2,"n":5}
c={"c":3}
test_list =[a,b,c]
result = {}
for i in test_list:
result=AddTest(i) +AddTest(result)
print result
