How to Rename a Dictionary Key in Python?

Renaming a Dictionary Key in Python

In Python, dictionaries are mutable data structures that store key-value pairs. Changing the name of a key in a dictionary is a straightforward process that can be accomplished in several ways.

Two-Step Method:

1. Create a new key with the desired name and assign it the value of the old key.
2. Delete the old key from the dictionary.

dictionary = {1: 'one', 2: 'two', 3: 'three'}
new_key = 'ONE'
dictionary[new_key] = dictionary[1]
del dictionary[1]

One-Step Method:

Alternatively, you can use the pop method to simultaneously create the new key and delete the old key. However, this method raises a KeyError if the old key does not exist.

dictionary = {1: 'one', 2: 'two', 3: 'three'}
new_key = 'ONE'
dictionary[new_key] = dictionary.pop(1)

Precautions:

Note that using the one-step method will permanently delete the value associated with the old key. Therefore, if you intend to preserve the value, use the two-step method instead.

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