mypy sadly doesn't accept 'NewType('MyType', Any)'; it complains 'error: Argument 2 to NewType(...) must be subclassable (got "Any") [valid-newtype]'. Possibly this is allowed by other Python type checkers. It is accepted at runtime, and I wish mypy allowed Any as a specific exemption to its checks.

(I'm the author of the linked-to article.)