Guido van Rossum <gu...@python.org> added the comment: Such a mechanism exists, and is called Protocols. See PEP 544 (https://www.python.org/dev/peps/pep-0544/). While the PEP is still in draft, it is supported by mypy. You need to import the 'Protocol' base class from typing_extensions (which is a PyPI module, so use `pip install typing_extensions`).
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