How to Rename Dictionary Keys in Python Without Reassigning Values or Iteration?

Renaming Dictionary Keys in Python

The question is, can a dictionary key be renamed without reassigning its value or iterating through the dictionary itself?

Regular Dictionary:

For a regular dictionary, the renaming can be done with the following code:

<code class="python">mydict[k_new] = mydict.pop(k_old)</code>

In this code, the item is moved to the end of the dictionary unless k_new already exists, in which case its value is overwritten.

Ordered Dictionary (Python 3.7 ):

For an OrderedDict, the ordering needs to be maintained. The easiest way to rename a key is to create a new dictionary with the desired key name:

<code class="python">{k_new if k == k_old else k:v for k, v in od.items()}</code>

Ordered Dictionary (General):

In general, modifying the key itself is not practical because keys are immutable and cannot be modified. Therefore, the solution is to create a new dictionary with the desired key name using a generator expression:

<code class="python">OrderedDict((k_new if k == k_old else k, v) for k, v in od.items())</code>

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