python - 更改字典中键的名称

Question

如何更改 Python 字典中条目的键？

Answer 1

两步轻松搞定:

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

或在 1 步中:

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]。

>>> 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