连接多个字典以创建新列表，其值作为原始字典的值列表

我使用的是 Python 2.7，并且在这里查看了几个解决方案，如果您知道要合并多少个字典，这些解决方案就有效，但我可以有 2 到 5 个之间的任何内容。

我有一个循环，它生成一个具有相同键但不同值的字典。我想将新值添加到以前的值中。

Such as:

for num in numbers:
    dict = (function which outputs a dictionary)
    [merge with dictionary from previous run of the loop]

So if:

dict (from loop one) = {'key1': 1,
 'key2': 2,
 'key3': 3}

and

dict (from loop two) = {'key1': 4,
 'key2': 5,
 'key3': 6}

结果的字典将是：

dict = {'key1': [1,4]
 'key2': [2,5],
 'key3': [3,6]}

Use a defaultdict:

In [18]: def gen_dictionaries():
    ...:     yield {'key1': 1, 'key2': 2, 'key3': 3}
    ...:     yield {'key1': 4, 'key2': 5, 'key3': 6}
    ...:

In [19]: from collections import defaultdict

In [20]: final = defaultdict(list)

In [21]: for d in gen_dictionaries():
    ...:     for k, v in d.iteritems():
    ...:         final[k].append(v)
    ...:

In [22]: final
Out[22]: defaultdict(list, {'key1': [1, 4], 'key2': [2, 5], 'key3': [3, 6]})