


How to Rename Dictionary Keys in Python Without Reassigning Values or Iteration?
Nov 04, 2024 am 07:02 AMRenaming 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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