Custom Python Dictionaries: Inheriting From dict vs UserDict

Creating dictionary-like classes may be a requirement in your Python career. Specifically, you may be interested in making custom dictionaries with modified behavior, new functionalities, or both. In Python, you can do this by inheriting from an abstract base class, by subclassing the built-in dict class directly, or by inheriting from UserDict.

In this tutorial, you’ll learn how to:

• Create dictionary-like classes by inheriting from the built-in dict class
• Identify common pitfalls that can happen when inheriting from dict
• Build dictionary-like classes by subclassing UserDict from the collections module

Additionally, you’ll code a few examples that’ll help you understand the pros and cons of using dict vs UserDict to create your custom dictionary classes.

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