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1. hauntsaninja

   added

   feature

   on Jan 5, 2021
2. hauntsaninja commented on Jan 22, 2021

   

   hauntsaninja

   on Jan 22, 2021

   CollaboratorAuthor

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   Should also make sure to test base classes: class C(A[int | None]): ... and aliases X = int | str
3. hauntsaninja

   added

   priority-1-normal

   on Jan 22, 2021
4. hauntsaninja

   added

   priority-0-high

   and removed

   priority-1-normal

   on Feb 18, 2021
5. hauntsaninja

   changed the title [-]Support PEP 604 syntax in isinstance[/-] [+]Support PEP 604 syntax for runtime use cases[/+] on Feb 18, 2021
6. JukkaL

   added 3 commits that reference this issue on Jul 6, 2021

   Support union type syntax in type applications, aliases and casts

   309d797

   Support union type syntax in runtime contexts (#10770)

   56618b9

   Support new union syntax in stubs always in runtime context

   dc96406
7. JukkaL

   self-assigned this

   on Jul 6, 2021
8. JukkaL

   added 2 commits that reference this issue on Jul 6, 2021

   Support new union syntax in stubs always in runtime context (#10771)

   53836bd

   Support new union type syntax with isinstance

   0cbb3fd
9. JukkaL

   closed this as completedin #10775on Jul 7, 2021
10. JukkaL

    added a commit that references this issue on Jul 7, 2021

    Support new union type syntax with isinstance (#10775)

    This issue will close once commit f137f11 is merged into the 'master' branch.

    f137f11
11. hauntsaninja

    added

    good-second-issue

    on Mar 24, 2022
12. saulshanabrook commented on Aug 2, 2022

    

    saulshanabrook

    on Aug 2, 2022

    Contributor

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    Are type aliases supported with the new union syntax? I am getting Unsupported left operand type for | ("Type[int]") for something like Expr = int | str
13. asottile commented on Aug 2, 2022

    

    asottile

    on Aug 2, 2022

    Contributor

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    works fine for me:

    $ mypy t.py 
    Success: no issues found in 1 source file
    $ cat t.py 
    X = int | str
    
    def f(x: X) -> X:
        return x
    f(1)
    f('2')
    $ mypy --version
    mypy 0.971 (compiled: yes)

    note that mypy here is installed to python3.10 -- you may need to do that or use the python version setting
14. saulshanabrook commented on Aug 2, 2022

    

    saulshanabrook

    on Aug 2, 2022

    Contributor

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    Thanks, yeah was set to a different python version, sorry about that.