No, it's not possible, because >>> int | str Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: unsupported operand type(s) for |: 'type' and 'type'
Regards Philippe Prados Le jeu. 29 août 2019 à 14:55, Inada Naoki <songofaca...@gmail.com> a écrit : > I don't want to add runtime behaviors for static type hinting. > > There is PEP 563 instead. > Tools like mypy can implement them without touching runtime behavior. > > > On Thu, Aug 29, 2019 at 9:48 PM Philippe Prados <philippe.pra...@gmail.com> > wrote: > >> Hello everybody, >> >> Scala 3 propose the a new syntax for Union type. See here >> <https://dotty.epfl.ch/docs/reference/new-types/union-types.html>. I >> propose to add a similar syntax in Python. >> >> # Operator for Union >> assert( int | str == Union[int,str]) >> assert( int | str | float == Union[int,str,float]) >> # Operator for Optional >> assert( ~int == Optional[int]) >> >> Now, it's possible to write: >> >> def fn(bag:List[int | str], option: ~int = None) -> float | str: ... >> >> in place of >> >> def fn(bag:List[Option[int,str]], option: Optional[int] = None) -> >> Union[float,str]: ... >> >> I think these syntaxes are more clear, and can help with the adoption of >> typing. >> >> >> I test and implement these ideas in a two fork : One for CPython >> <https://github.com/pprados/cpython> and one for MyPy >> <https://github.com/pprados/mypy>. See the branches add_OR_to_types (for >> Union syntax) or add_INVERT_to_types (for Union and Optional syntax). >> >> How I implement that ? I add the operators __or__ and __revert__ to >> PyType_Type. The C code is similar of : >> >> from typing import * >> def type_or(self,right): >> return Union[self,right] >> type(type).__or__ = type_or >> >> Actually, the accepted syntax for typing is : >> >> annotation: name_type >> name_type: NAME (args)? >> args: '[' paramslist ']' >> paramslist: annotation (',' annotation)* [','] >> >> I propose to extend the syntax to : >> >> annotation: ( name_type | or_type | invert_type ) >> name_type: NAME (args)? >> args: '[' paramslist ']' >> paramslist: annotation (',' annotation)* [','] >> >> or_type: name_type '|' annotation >> >> invert_type: '~' annotation >> >> >> What do you think about that ? >> >> The draft of a PEP is here >> <https://github.com/pprados/peps/blob/master/pep-9999.rst>. >> >> Regards >> _______________________________________________ >> Python-ideas mailing list -- python-ideas@python.org >> To unsubscribe send an email to python-ideas-le...@python.org >> https://mail.python.org/mailman3/lists/python-ideas.python.org/ >> Message archived at >> https://mail.python.org/archives/list/python-ideas@python.org/message/FCTXGDT2NNKRJQ6CDEPWUXHVG2AAQZZY/ >> Code of Conduct: http://python.org/psf/codeofconduct/ >> > > > -- > Inada Naoki <songofaca...@gmail.com> >
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