Implementing Singletons in Python: Best Practices and Alternatives
python•Jan 22, 2026

Implementing Singletons in Python: Best Practices and Alternatives

The singleton pattern restricts a class to a single instance, but it can create more problems than it solves. Learn how to implement singletons in Python and when to use them.

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Original source

Key summary

This tutorial explains the singleton pattern, its implementation in Python, and discusses when it might be appropriate. It also explores better alternatives for most use cases.

TL;DR

  • Singletons restrict a class to a single instance.
  • The classic singleton pattern uses a class variable to store the single instance.
  • A thread-safe singleton can be implemented using a metaclass.
  • Global state is problematic and can make debugging difficult.
  • Better alternatives to the singleton pattern include dependency injection and service locators.
  • Singletons are acceptable in a few genuine use cases, such as configuration managers and logging systems.

This content is automatically summarized using AI. For full context, always refer to the original article.

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