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• Common decorators are @classmethod and @staticmethod.
• Flask uses them to mark and configure the routes.
• Pytest uses them to add marks to the tests.

• functools

• dataclasses
• Logging calls with parameters.
• Logging elapsed time of calls.
• Access control in Django or other web frameworks. (e.g. login required)
• Memoization (caching)
• Retry
• Function timeout
• Locking for thread safety
• Decorator Library