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1. zhukovgreen

   added

   bugSomething isn't workingSomething isn't working

   on Mar 14, 2023
2. zhukovgreen

   added a commit that references this issue on Mar 16, 2023

   Pin mypy version to ensure correct work of the mypy plugin

   ...

   4050e2a
3. dmalt commented on Jul 6, 2023

   

   dmalt

   on Jul 6, 2023

   Last edited by dmalt

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   Any workaround for this one? I've tried different mypy versions but mypy-plugin doesn't want to work with any of them.

   UPD.
   The plugin does seem to work for mypy version < 0.981 and python < 3.10.7, but mypy this old stops to recognise phantom types. It throws Internal error: attempted lookup of unknown name [misc] for phantom types at me.

   Also I'm getting a mypy error when calling the function I'm trying to overload
   Argument 1 to "read" has incompatible type "Path"; expected <nothing>

   All in all, I wasn't able to make mypy-plugin to work, and it kinda ruins the whole type-safety idea of classes for me. Maybe I'm missing something?

   UPD2.
   That's weird but mypy-plugin starts to work as expected as soon as I remove __init__.py from my package.
4. dmalt commented on Jul 7, 2023

   

   dmalt

   on Jul 7, 2023

   Last edited by dmalt

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   Ok, after downgrading python and mypy my problems boiled down to this minimal example:

   (test_classes) $ mypy --version
   mypy 0.971 (compiled: yes)
   
   (test_classes) $ python --version
   Python 3.10.6
   
   (test_classes) $ ll  # 
   total 16
   -rw-r--r--  1 ***  ***    83B Jul  6 21:22 setup.cfg
   -rw-r--r--  1 ***  ***   438B Jul  7 16:50 try_classes.py
   
   (test_classes) $ cat setup.cfg
   # In setup.cfg or mypy.ini:
   [mypy]
   plugins =
     classes.contrib.mypy.classes_plugin
   
   (test_classes) $ cat try_classes.py
   from classes import typeclass
   
   @typeclass
   def to_json(instance) -> str:
       """That's a definition!"""
   
   @to_json.instance(str)
   def _to_json_str(instance: str) -> str:
       return '"{0}"'.format(instance)
   
   @to_json.instance(None)
   def _to_json_none(instance: None) -> str:
       return "null"
   
   assert to_json("text") == '"text"'
   assert to_json(None) == "null"
   
   reveal_type(to_json)
   
   (test_classes) $ mypy try_classes.py
   try_classes.py:22: note: Revealed type is "classes._typeclass._TypeClass[Union[None, builtins.str], def (instance: Any) -> builtins.str, <nothing>, Literal['try_classes.to_json']]"
   Success: no issues found in 1 source file
   
   (test_classes) $ touch __init__.py
   
   ~/code/python/test_classes
   (test_classes) $ mypy try_classes.py
   try_classes.py:9: error: Internal error: attempted lookup of unknown name
   try_classes.py:14: error: Internal error: attempted lookup of unknown name
   try_classes.py:19: error: Argument 1 to "to_json" has incompatible type "str"; expected <nothing>
   try_classes.py:20: error: Argument 1 to "to_json" has incompatible type "None"; expected <nothing>
   try_classes.py:22: note: Revealed type is "classes._typeclass._TypeClass[<nothing>, def (instance: Any) -> builtins.str, <nothing>, Literal['test_classes.try_classes.to_json']]"
   Found 4 errors in 1 file (checked 1 source file)

   I'm launching on MacOS Ventura 13.4.1. As you see, adding __init__.py breaks the typechecking.

   👍React with 👍1Reacted by zhukovgreen
5. eineruntervielen commented on Sep 25, 2023

   

   eineruntervielen

   on Sep 25, 2023

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   any updates on this issue?

   👍React with 👍1Reacted by Jellyfish.tech
6. jellyfish-tech commented on Nov 1, 2023

   

   jellyfish-tech

   on Nov 1, 2023

   Last edited by jellyfish-tech

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   Same problem here, no solution found in documentation, is there any workaround?
7. zhukovgreen commented on Apr 5, 2024

   

   zhukovgreen

   on Apr 5, 2024

   Author

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   The solution so far to hard pin mypy==0.971

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