Web Reference: Jan 17, 2026 · This example uses the Classic Singleton pattern to build a simple multi-threaded web crawler. A single shared crawler instance stores the URL queue, visited pages, and downloaded images, while multiple threads access the same data to crawl pages and download images without duplication. Jan 22, 2026 · You've learned several ways to implement singletons in Python: the classic pattern, decorators, metaclasses, and thread-safe variants. Each approach has trade-offs in complexity, readability, and thread safety. Full code example in Python with detailed comments and explanation. Singleton is a creational design pattern, which ensures that only one object of its kind exists and provides a single point of access to it for any other code.
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