Home Backend Development Python Tutorial How to Rename Dictionary Keys in Python Without Reassigning Values or Iteration?

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

Nov 04, 2024 am 07:02 AM

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>
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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>
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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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