更改字典中键的名称 [英] Change the name of a key in dictionary

问题描述

我想更改 Python 字典中某个条目的键.

有没有直接的方法可以做到这一点?

解决方案

只需 2 个步骤即可轻松完成:

dictionary[new_key] = dictionary[old_key]删除字典[old_key]

或者一步:

dictionary[new_key] = dictionary.pop(old_key)

如果 dictionary[old_key] 未定义，则会引发 KeyError.请注意，这将删除dictionary[old_key].

<预><代码>>>>字典 = { 1: '一', 2:'二', 3:'三' }>>>字典['ONE'] = dictionary.pop(1)>>>字典{2:'二'，3:'三'，'一':'一'}>>>字典['ONE'] = dictionary.pop(1)回溯(最近一次调用最后一次):文件<input>"，第 1 行，在 <module> 中关键错误:1

I want to change the key of an entry in a Python dictionary.

Is there a straightforward way to do this?

解决方案

Easily done in 2 steps:

dictionary[new_key] = dictionary[old_key]
del dictionary[old_key]

Or in 1 step:

dictionary[new_key] = dictionary.pop(old_key)

which will raise KeyError if dictionary[old_key] is undefined. Note that this will delete dictionary[old_key].

>>> dictionary = { 1: 'one', 2:'two', 3:'three' }
>>> dictionary['ONE'] = dictionary.pop(1)
>>> dictionary
{2: 'two', 3: 'three', 'ONE': 'one'}
>>> dictionary['ONE'] = dictionary.pop(1)
Traceback (most recent call last):
  File "<input>", line 1, in <module>
KeyError: 1

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