Robert Bradshaw schrieb am 06.09.2017 um 08:28: > On Tue, Sep 5, 2017 at 10:44 PM, Stefan Behnel wrote: >> Robert Bradshaw schrieb am 06.09.2017 um 07:21: >>> I'm not a huge fan of behaving differently depending on what syntax >>> was used to annotate the return type--I'd rather they be 100% aliases >>> of each other. >> >> Regarding this bit - I already chose to implement some differences for >> annotation typing. Mainly, if you say >> >> def f(x: int) -> float: >> return x >> >> then the (plain "def") function will actually be typed as "double >> f(object)"., assuming that you probably meant the Python types and not the >> C types. If you want the C types "int" and "float", you have to use either >> of these: >> >> def f1(x: cython.int) -> cython.float: >> return x >> >> cpdef float f2(int x): >> return x >> >> That is because the main use case of signature annotations is Python code >> compatibility, so I tried to change the semantics as little as possible >> from what the code would be expected to do in Python. > > What about > > def f(x: float) -> int > return x * 2 > > would that throw an error if x was, say, a str? I think float -> c > double but int -> python object will be surprising. I also worry a bit > about x: float being enforced but x: List[float] not being so. > >> I also considered if distinguishing between .py and .pyx files would make >> sense here, but adapting the type interpretation to that felt much worse >> than the above, > > Agreed, -1 to doing this. > >> which is at least consistent regarding the typing scheme >> that you use. >> >> I think this type interpretation is a reasonable, use case driven >> difference to make. Thus my question if we should extend this to the >> exception declaration. > > I suppose you've already made a case for deviating... > > I guess I think it'd be nice to change the default universally, but > that's perhaps a bigger conversation.
What do you think of this? https://github.com/cython/cython/pull/1865 Stefan _______________________________________________ cython-devel mailing list cython-devel@python.org https://mail.python.org/mailman/listinfo/cython-devel
