[Python-ideas] Re: Inspired by Scala, a new syntax for Union type

29 Aug 2019


      On Thu, Aug 29, 2019 at 10:03 PM Philippe Prados <philippe.prados@gmail.com>
wrote:
...
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
It is possible because:

Python 3.7.4 (default, Jul  9 2019, 18:13:23)
[Clang 10.0.1 (clang-1001.0.46.4)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
...
...
...
from __future__ import annotations
def foo() -> int | str:
...     pass
...
foo.__annotations__
{'return': 'int | str'}
Please read PEP 563.

Regards,

-- 
Inada Naoki  <songofacandy@gmail.com>