I tried playing with the KeyedTuple trying to add overloads or something, but I ended up reading a bunch of issues/discussion in mypy and typing and realizing that Tuple and Callable are the only variadics and that there's currently no way to declare variadic Generic sub-types/sub-classes of Tuple.
One option I considered was creating several generic classes with a fixed amount of type variables in each and making the KeyedTuple a union of all of them, but that wouldn't let using it as a Generic in return types, so I think that doesn't make that much sense.
The other option I considered was trying to hack around with typing._VariadicGenericAlias to try to replicate the variadic-ness of Tuple, given that KeyedTuple is just an extended tuple. But I guess I should avoid touching that as it's a "private" class of typing.
tiangolo
commented
4 years ago
Add one overload to
Session.query()to handle return types for a query of one single item.This helps with the specific case of querying a single model or column.
For more than one item in the
query()it seems that another plugin hook is the only option, as the return is not a plainTuplebut aKeyedTuple.This is what I found possible continuing the discussion in https://github.com/dropbox/sqlalchemy-stubs/pull/149
I tried playing with the
KeyedTupletrying to add overloads or something, but I ended up reading a bunch of issues/discussion in mypy andtypingand realizing thatTupleandCallableare the only variadics and that there's currently no way to declare variadic Generic sub-types/sub-classes ofTuple.One option I considered was creating several generic classes with a fixed amount of type variables in each and making the
KeyedTuplea union of all of them, but that wouldn't let using it as a Generic in return types, so I think that doesn't make that much sense.The other option I considered was trying to hack around with
typing._VariadicGenericAliasto try to replicate the variadic-ness ofTuple, given thatKeyedTupleis just an extended tuple. But I guess I should avoid touching that as it's a "private" class oftyping.