如何在python中将字典与相同的键组合？ [英] How can I combine dictionaries with the same keys in python?

问题描述

假设我有一个这样的字典列表：

  dict [0]是
 {'key_a '：valuex1，
'key_b'：valuex2，
'key_c'：valuex3} 
 
 dict [1]是
 {'key_a'：valuey1，
'key_b'：valuey2，
'key_c'：valuey3} 
 
 dict [2]是
 {'key_a'：valuez1，
'key_b' valuez2，
'key_c'：valuez3} 
  

我想拿这些并构造一个大字典如下：

  big_dict：
 {'key_a'：[valuex1，valuey1，valuez1]，
'key_b'：[valuex2，valuey2，valuez2]，
'key_c'：[valuex3，valuey3，valuez3]} 
  

有没有任何优雅的 zip - 像我这样做的方式吗？

所有的键总是相同的。

我可以随时迭代每个键，并构建一个新的列表字典，但似乎非常类似pythonlike。

解决方案

  big_dict = {} 
 for k in dicts [0]：
 big_dict [k] = [d [ k] for d in dicts] 
  

（我更名为 dict to dicts 因为dict是一个内置的，而dicts更有意义。）

或，具有一个字母理解：对于k中的k，在dict中，

  {k：[d [k] for d in dicts] } 
  

或对于Python< 2.7：

{pre> dict（（k，[d [k] for d in dicts]）for k in dicts [0]）


Let's say I have a list of dictionaries like so:

dict[0] is
{'key_a': valuex1,
 'key_b': valuex2,
 'key_c': valuex3}

dict[1] is
{'key_a': valuey1,
 'key_b': valuey2,
 'key_c': valuey3}

dict[2] is
{'key_a': valuez1,
 'key_b': valuez2,
 'key_c': valuez3}

I would like to take these and construct a big dictionary like so:

big_dict:
{'key_a': [valuex1, valuey1, valuez1],
 'key_b': [valuex2, valuey2, valuez2],
 'key_c': [valuex3, valuey3, valuez3]}

Is there any elegant "zip"-like way for me to do this?

All the keys are always going to be identical.

I can always iterate the keys on each and construct a new dictionary of lists but that seems very un-pythonlike.

解决方案

big_dict = {}
for k in dicts[0]:
    big_dict[k] = [d[k] for d in dicts]

(I renamed your dict to dicts since dict is a built-in, and dicts makes more sense.)

Or, with a dict comprehension:

{ k:[d[k] for d in dicts] for k in dicts[0] }

or, for Python <2.7:

dict((k, [d[k] for d in dicts]) for k in dicts[0])

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