How to Remove Elements and Create Copies of Dictionaries in Python?

Removing from and Copying Dictionaries in Python

Deleting Elements from a Dictionary

To delete an item from a Python dictionary, use the del statement with the key of the element you want to remove:

<code class="python">del d[key]</code>

Be aware that this operation modifies the original dictionary.

Creating a New Dictionary Without an Item

If you want to create a new dictionary without a specific item, without modifying the original, you can make a copy of the dictionary and remove the item from the copy:

<code class="python">def removekey(d, key):
    r = dict(d)
    del r[key]
    return r</code>

The dict() constructor makes a shallow copy. For a deep copy, use the copy module.

Note on Performance

Copy operations introduce potential performance considerations:

• Constant-time operations on the dictionary become linear-time operations.
• Memory usage increases linearly with each copy created.

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