Implementing the Command Pattern in Python
python•Mar 23, 2026

Implementing the Command Pattern in Python

The command pattern is a behavioral design pattern that encapsulates a request as an object. This allows for parameterization, queuing, and undo/redo functionality. In this tutorial, we'll implement the command pattern in Python using a text editor example.

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Key summary

This tutorial explains the command pattern and its implementation in Python. It provides a practical example of a text editor that supports undo functionality.

TL;DR

  • The command pattern encapsulates a request as an object
  • It allows for parameterization, queuing, and undo/redo functionality
  • The pattern has four key participants: Command, Concrete Command, Receiver, and Invoker
  • The Command interface has execute() and undo() methods
  • Concrete commands implement execute() and undo() for specific actions
  • The Receiver object performs the actual work
  • The Invoker triggers commands and manages history
  • The command pattern is useful for implementing undo/redo functionality and scheduling tasks

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