What's the Most Efficient Way to Create Singletons in Python?

Defining Singletons in Python: A Concise and Efficient Approach

Despite the prevalence of various methods for defining singletons in Python, there exists a prevailing consensus within the Stack Overflow community. The preferred approach favors defining singletons using modules rather than classes.

Module-Based Singletons

Modules provide a simple and elegant way to create singletons. As modules cannot be instantiated repeatedly, all variables bound to the module effectively become part of the singleton instance. This approach eliminates the need for elaborate class structures or protection against multiple instantiations.

Class-Based Singletons: A Caveat

While it is possible to define singletons using classes, Python lacks the ability to create private classes or constructors. Consequently, enforcing singleton behavior solely through class design is impractical. Instead, relying on convention in the use of the API is recommended.

Conclusion

For practical and efficient singleton implementations in Python, the module-based approach is widely recognized as the preferred choice. It offers simplicity, elegance, and eliminates the need for complex object-oriented constructs.

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