x = { 'apple': 1, 'banana': 2 }y = { 'banana': 10, 'pear': 11 }需要把两个字典合并，最后输出结果是：{ 'apple': 1, 'banana': 12, 'pear': 11 }

 

利用collections.Counter可轻松办到

>>> x = { 'apple': 1, 'banana': 2 }>>> y = { 'banana': 10, 'pear': 11 }>>> from collections import Counter>>> X,Y = Counter(x), Counter(y)>>> z = dict(X+Y)>>> z

>>>from collections import Counter>>>dict(Counter(x)+Counter(y))