Python Annotations Rare Use Cases
· 7 min read
Python annotations, introduced in PEP 3107 for function parameters and return values, were initially generic metadata slots. While their primary use has become type hinting (PEP 484), expert developers leverage them for advanced and niche applications that go far beyond simple type declarations.
These use cases often involve frameworks or metaprogramming to make annotations act as declarative configuration or runtime execution instructions.