10 Practical Python Design Patterns Used in Django, Flask, and FastAPI

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A DEV Community guide highlights 10 Python design patterns that genuinely appear in popular frameworks like Django, Flask, and FastAPI, rather than promoting theoretical overuse. The article covers patterns such as Singleton, Factory, Abstract Factory, and Builder, providing working code examples for each. For every pattern, it explains what it does, where it already appears in real-world Python, and — critically — when not to use it. The guide emphasizes that patterns are most valuable for naming recurring structural decisions and making logic independently testable, but warns that abstraction carries a cost. Developers are advised to default to simpler solutions and only reach for a pattern when it solves a concrete problem.

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