通过嵌套键合并嵌套词典？

Question

我有几个带有不同和常用键的字典,以及嵌套字典中的不同和常用键.下面是一个简化的例子,实际的词典有数千个键.

{1:{"Title":"Chrome","Author":"Google","URL":"http://"}}
{1:{"Title":"Chrome","Author":"Google","Version":"7.0.577.0"}}
{2:{"Title":"Python","Version":"2.5"}}

我想合并到一个字典中.

{1:{"Title":"Chrome","Author":"Google","URL":"http://","Version":"7.0.577.0"},
 2:{"Title":"Python","Version":"2.5"}}

我可以迭代两个字典,比较键和update嵌套字典,但可能有更高效或pythonic的方式来做到这一点.如果没有,哪个效率最高？

无需比较嵌套字典的值.

Answer 1

from collections import defaultdict

mydicts = [
   {1:{"Title":"Chrome","Author":"Google","URL":"http://"}},
   {1:{"Title":"Chrome","Author":"Google","Version":"7.0.577.0"}},
   {2:{"Title":"Python","Version":"2.5"}},
]

result = defaultdict(dict)

for d in mydicts:
    for k, v in d.iteritems():
        result[k].update(v)

print result

defaultdict(<type 'dict'>, 
    {1: {'Version': '7.0.577.0', 'Title': 'Chrome', 
         'URL': 'http://', 'Author': 'Google'}, 
     2: {'Version': '2.5', 'Title': 'Python'}})