[Python-Dev] Is static typing still optional?
raymond.hettinger at gmail.com
Sun Dec 10 16:24:17 EST 2017
The make_dataclass() factory function in the dataclasses module currently requires type declarations. It would be nice if the type declarations were optional.
With typing (currently works):
Point = NamedTuple('Point', [('x', float), ('y', float), ('z', float)])
Point = make_dataclass('Point', [('x', float), ('y', float), ('z', float)])
Without typing (only the first currently works):
Point = namedtuple('Point', ['x', 'y', 'z']) # underlying store is a tuple
Point = make_dataclass('Point', ['x', 'y', 'z']) # underlying store is an instance dict
This proposal would make it easy to cleanly switch between the immutable tuple-based container and the instancedict-based optionally-frozen container. The proposal would make it possible for instructors to teach dataclasses without having to teach typing as a prerequisite. And, it would make dataclasses usable for projects that have elected not to use static typing.
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