Python 将一个字典中的键/值复制到另一个字典中

Copying a key/value from one dictionary into another

提问by bryan

I have a dict with main data (roughly) as such: {'UID': 'A12B4', 'name': 'John', 'email': '[email protected]}

我有一个包含主要数据的字典（大致）如下： {'UID': 'A12B4', 'name': 'John', 'email': '[email protected]}

and I have another dict like: {'UID': 'A12B4', 'other_thing: 'cats'}

我还有另一个 dict 像： {'UID': 'A12B4', 'other_thing: 'cats'}

I'm unclear how to "join" the two dicts to then put "other_thing" to the main dict. What I need is: {'UID': 'A12B4', 'name': 'John', 'email': '[email protected], 'other_thing': 'cats'}

我不清楚如何“加入”两个字典，然后将“other_thing”放入主字典。我需要的是：{'UID': 'A12B4', 'name': 'John', 'email': '[email protected], 'other_thing': 'cats'}

I'm pretty new to comprehensions like this, but my gut says there has to be a straight forward way.

我对这样的理解很陌生，但我的直觉说必须有一个直接的方法。

采纳答案by mhlester

you want to use the dict.updatemethod:

你想使用的dict.update方法：

d1 = {'UID': 'A12B4', 'name': 'John', 'email': '[email protected]'}
d2 = {'UID': 'A12B4', 'other_thing': 'cats'}
d1.update(d2)

Outputs:

输出：

{'email': '[email protected]', 'other_thing': 'cats', 'UID': 'A12B4', 'name': 'John'}

From the Docs:

从文档：

Update the dictionary with the key/value pairs from other, overwriting existing keys. Return None.

使用其他键/值对更新字典，覆盖现有键。返回无。

回答by Slater Victoroff

If you want to join dictionaries, there's a great built-in function you can call, called update.

如果你想加入字典，你可以调用一个很棒的内置函数，叫做update.

Specifically:

具体来说：

test = {'A': 1}
test.update({'B': 2})
test
>>> {'A':1, 'B':2}