Somehow fails when run on Python-3.9.0a5 #8614

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1. dimaqq commented on Apr 1, 2020

   

   dimaqq

   on Apr 1, 2020

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   Simplified reproducer:

   … ~> python3.9 -m venv test-3.9-mypy
   … ~> source test-3.9-mypy/bin/activate.fish
   (test-3.9-mypy) … ~> pip install mypy
   Collecting mypy
     Using cached https://files.pythonhosted.org/packages/66/65/6eee965deba36e9899a96879c9ce12c93b6ffe2d154b6253b72e2408878e/mypy-0.770-py3-none-any.whl
   Collecting mypy-extensions<0.5.0,>=0.4.3 (from mypy)
     Using cached https://files.pythonhosted.org/packages/5c/eb/975c7c080f3223a5cdaff09612f3a5221e4ba534f7039db34c35d95fa6a5/mypy_extensions-0.4.3-py2.py3-none-any.whl
   Collecting typed-ast<1.5.0,>=1.4.0 (from mypy)
     Using cached https://files.pythonhosted.org/packages/9f/2b/fc9c56c3630ed44ead9ed74919c1e445e31bb883098d1ca7b9d2b9af7b0a/typed_ast-1.4.1-cp39-cp39-macosx_10_15_x86_64.whl
   Collecting typing-extensions>=3.7.4 (from mypy)
     Using cached https://files.pythonhosted.org/packages/03/92/705fe8aca27678e01bbdd7738173b8e7df0088a2202c80352f664630d638/typing_extensions-3.7.4.1-py3-none-any.whl
   Installing collected packages: mypy-extensions, typed-ast, typing-extensions, mypy
   Successfully installed mypy-0.770 mypy-extensions-0.4.3 typed-ast-1.4.1 typing-extensions-3.7.4.1
   WARNING: You are using pip version 19.2.3, however version 20.0.2 is available.
   You should consider upgrading via the 'pip install --upgrade pip' command.
   (test-3.9-mypy) … ~> cat issue8614.py
   from asyncio import Future
   from dataclasses import dataclass, field
   from typing import Optional
   
   
   @dataclass
   class Channel:
       sid: int
       fut: Optional[Future]
   (test-3.9-mypy) … ~> mypy issue8614.py
   issue8614.py:9: error: syntax error in type comment
   Found 1 error in 1 file (checked 1 source file)
   (test-3.9-mypy) … ~> python --version
   Python 3.9.0a5
   (test-3.9-mypy) … ~>

   vs. working 3.8

   … ~> python3.8 -m venv test-3.8-mypy
   … ~> source test-3.8-mypy/bin/activate.fish
   (test-3.8-mypy) … ~> pip install mypy
   Collecting mypy
     Using cached https://files.pythonhosted.org/packages/8b/39/caf3165b3623233fd2b62a5ce01e652cb1a8bb82d002da423ce310e32ccb/mypy-0.770-cp38-cp38-macosx_10_9_x86_64.whl
   Collecting mypy-extensions<0.5.0,>=0.4.3 (from mypy)
     Using cached https://files.pythonhosted.org/packages/5c/eb/975c7c080f3223a5cdaff09612f3a5221e4ba534f7039db34c35d95fa6a5/mypy_extensions-0.4.3-py2.py3-none-any.whl
   Collecting typed-ast<1.5.0,>=1.4.0 (from mypy)
     Using cached https://files.pythonhosted.org/packages/eb/a1/7878754f86bddd8f65f452e06790d2fd393d145f13be37d7092cd7b0f60e/typed_ast-1.4.1-cp38-cp38-macosx_10_15_x86_64.whl
   Collecting typing-extensions>=3.7.4 (from mypy)
     Using cached https://files.pythonhosted.org/packages/03/92/705fe8aca27678e01bbdd7738173b8e7df0088a2202c80352f664630d638/typing_extensions-3.7.4.1-py3-none-any.whl
   Installing collected packages: mypy-extensions, typed-ast, typing-extensions, mypy
   Successfully installed mypy-0.770 mypy-extensions-0.4.3 typed-ast-1.4.1 typing-extensions-3.7.4.1
   WARNING: You are using pip version 19.2.3, however version 20.0.2 is available.
   You should consider upgrading via the 'pip install --upgrade pip' command.
   (test-3.8-mypy) … ~> cat issue8614.py
   from asyncio import Future
   from dataclasses import dataclass, field
   from typing import Optional
   
   
   @dataclass
   class Channel:
       sid: int
       fut: Optional[Future]
   (test-3.8-mypy) … ~> mypy issue8614.py
   Success: no issues found in 1 source file
   (test-3.8-mypy) … ~> python --version
   Python 3.8.2
   (test-3.8-mypy) … ~>
2. msullivan commented on Apr 3, 2020

   

   msullivan

   on Apr 3, 2020

   Collaborator

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   I was able to reproduce this. Originally I installed mypy on 3.9 in a virtualenv and it passed, but when I did it in a venv it failed.

   I suspect this one is going to cause me some heartburn.
3. msullivan commented on Apr 3, 2020

   

   msullivan

   on Apr 3, 2020

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   OK, I retract that claim. I can just reproduce it with no trouble.
4. msullivan commented on Apr 3, 2020

   

   msullivan

   on Apr 3, 2020

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   OK the issue is that a bunch of stuff in the AST changed. I filed #8627 to be a more specific bug for that and will close this one. Thank you!
5. msullivan

   closed this as completedon Apr 3, 2020
6. PatMyron

   added a commit that references this issue on Dec 7, 2020

   testing Python 3.9

   ...

   6cedb1d
7. tai271828

   added 2 commits that reference this issue on Jan 30, 2021

   fix(template): update mypy version of pyproject.toml

   ...

   30949d1

   fix(template): update mypy version of pyproject.toml

   ...

   7fbcb33
8. PatMyron

   added a commit that references this issue on Mar 24, 2021

   testing Python 3.9

   ...

   3fc09d6