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We are analyzing https://github.com/pydantic/pydantic/issues/5191.

Title:
Mypy plugin crashes with `explicit_package_bases` set as true · Issue #5191 · pydantic/pydantic
Description:
Initial Checks I have searched GitHub for a duplicate issue and I'm sure this is something new I have searched Google & StackOverflow for a solution and couldn't find anything I have re...
Website Age:
17 years and 8 months (reg. 2007-10-09).

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Github.com uses WORDPRESS.

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🚀🌠 Tremendous Traffic: 10M - 20M visitors per month

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Prices on github.com are in US Dollars ($). They range from $4.00/month to $21.00/month.
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The estimated monthly recurring revenue (MRR) is $20,957,532.
The estimated annual recurring revenues (ARR) are $251,490,385.

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Keywords {🔍}

mypy, true, dmontagu, pydantic, file, line, issue, code, marcelopgc, bug, error, version, commented, plugin, mypysemanalpy, sign, explicitpackagebases, github, unconfirmed, contributor, share, pull, description, added, config, optional, pydanticmypypy, run, python, install, data, type, samuelcolvin, mentioned, reproduce, fix, navigation, resources, requests, actions, security, crashes, set, closed, searched, docs, fastapi, attributes, strict, plugins,

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9/site-packages/pydantic python version /python/mypy/issues version src/app/models/stages io/en/stable/common_issues 1-microsoft-standard-wsl2-x86_64 a-development-mypy-build true install path support mypy v1 venv/lib/python3 comment metadata assignees prevent mypy errors optional static typing dmontagu closed orm mode plugins easily share code src/app /marcelopgc/pydantic1 mypy version pydantic v1 dmontagu mentioned resources/ pydantic/mypy unconfirmed type strict mypy toml config type projects docs response python python-devtools plugin 6 pydantic compiled duplicate issue updating mypy mypy master mypy/semanal mypy/nodes tools - mypy crashing mypy explicit_package_bases set explicit_package_bases configuration `explicit_package_bases` set bug run mypy searched github json optional attributes 31 optional deps added recent call set_frozen assertionerror

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@marcelopgc I'm looking at this now — do you have example code you can share that causes this issue when you run mypy on it?
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Schema {🗺️}

DiscussionForumPosting:
      context:https://schema.org
      headline:Mypy plugin crashes with `explicit_package_bases` set as true
      articleBody:### Initial Checks - [X] I have searched GitHub for a duplicate issue and I'm sure this is something new - [X] I have searched Google & StackOverflow for a solution and couldn't find anything - [X] I have read and followed [the docs](https://docs.pydantic.dev) and still think this is a bug - [X] I am confident that the issue is with pydantic (not my code, or another library in the ecosystem like [FastAPI](https://fastapi.tiangolo.com) or [mypy](https://mypy.readthedocs.io/en/stable)) ### Description After updating mypy to v1.1.1, I added the following `pyproject.toml` config, as descripted in the [documentation](https://docs.pydantic.dev/mypy_plugin/#plugin-settings), to prevent mypy errors on classes with Optional attributes: ``` txt [tool.mypy] strict = true files = "src/app" mypy_path = "src/" namespace_packages = true explicit_package_bases = true follow_imports = "silent" ignore_missing_imports = true exclude = "(resources/.*)" plugins = [ "pydantic.mypy" ] warn_redundant_casts = true warn_unused_ignores = true disallow_any_generics = true check_untyped_defs = true no_implicit_reexport = true # for strict mypy: (this is the tricky one :-)) disallow_untyped_defs = true [tool.pydantic-mypy] init_forbid_extra = true init_typed = true warn_required_dynamic_aliases = true warn_untyped_fields = true ``` Using that config, I found an internal error while running mypy ``` src/app/models/stages.py:152: error: INTERNAL ERROR -- Please try using mypy master on GitHub: https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build Please report a bug at https://github.com/python/mypy/issues version: 1.1.1 Traceback (most recent call last): File "mypy/semanal.py", line 6261, in accept File "mypy/nodes.py", line 1123, in accept File "mypy/semanal.py", line 1561, in visit_class_def File "mypy/semanal.py", line 1641, in analyze_class File "mypy/semanal.py", line 1668, in analyze_class_body_common File "mypy/semanal.py", line 1751, in apply_class_plugin_hooks File "pydantic/mypy.py", line 150, in pydantic.mypy.PydanticPlugin._pydantic_model_class_maker_callback File "pydantic/mypy.py", line 315, in pydantic.mypy.PydanticModelTransformer.transform File "pydantic/mypy.py", line 524, in pydantic.mypy.PydanticModelTransformer.set_frozen AssertionError: src/app/models/stages.py:152: : note: use --pdb to drop into pdb ``` If remove the `explicit_package_bases` configuration, mypy is able to run without this setting. mypy version: ``` name : mypy version : 1.1.1 description : Optional static typing for Python dependencies - mypy-extensions >=1.0.0 - tomli >=1.1.0 - typing-extensions >=3.10 ``` ### Example Code _No response_ ### Python, Pydantic & OS Version ```Text pydantic version: 1.10.6 pydantic compiled: True install path: /workspace/.venv/lib/python3.9/site-packages/pydantic python version: 3.9.16 (main, Jan 11 2023, 15:55:30) [GCC 10.2.1 20210110] platform: Linux-5.10.102.1-microsoft-standard-WSL2-x86_64-with-glibc2.31 optional deps. installed: ['typing-extensions'] ``` ### Affected Components - [ ] [Compatibility between releases](https://docs.pydantic.dev/changelog/) - [ ] [Data validation/parsing](https://docs.pydantic.dev/usage/models/#basic-model-usage) - [ ] [Data serialization](https://docs.pydantic.dev/usage/exporting_models/) - `.dict()` and `.json()` - [ ] [JSON Schema](https://docs.pydantic.dev/usage/schema/) - [ ] [Dataclasses](https://docs.pydantic.dev/usage/dataclasses/) - [ ] [Model Config](https://docs.pydantic.dev/usage/model_config/) - [ ] [Field Types](https://docs.pydantic.dev/usage/types/) - adding or changing a particular data type - [ ] [Function validation decorator](https://docs.pydantic.dev/usage/validation_decorator/) - [ ] [Generic Models](https://docs.pydantic.dev/usage/models/#generic-models) - [ ] [Other Model behaviour](https://docs.pydantic.dev/usage/models/) - `construct()`, pickling, private attributes, ORM mode - [X] [Plugins](https://docs.pydantic.dev/) and integration with other tools - mypy, FastAPI, python-devtools, Hypothesis, VS Code, PyCharm, etc.
      author:
         url:https://github.com/marcelopgc
         type:Person
         name:marcelopgc
      datePublished:2023-03-14T20:16:04.000Z
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      url:https://github.com/5191/pydantic/issues/5191
      context:https://schema.org
      headline:Mypy plugin crashes with `explicit_package_bases` set as true
      articleBody:### Initial Checks - [X] I have searched GitHub for a duplicate issue and I'm sure this is something new - [X] I have searched Google & StackOverflow for a solution and couldn't find anything - [X] I have read and followed [the docs](https://docs.pydantic.dev) and still think this is a bug - [X] I am confident that the issue is with pydantic (not my code, or another library in the ecosystem like [FastAPI](https://fastapi.tiangolo.com) or [mypy](https://mypy.readthedocs.io/en/stable)) ### Description After updating mypy to v1.1.1, I added the following `pyproject.toml` config, as descripted in the [documentation](https://docs.pydantic.dev/mypy_plugin/#plugin-settings), to prevent mypy errors on classes with Optional attributes: ``` txt [tool.mypy] strict = true files = "src/app" mypy_path = "src/" namespace_packages = true explicit_package_bases = true follow_imports = "silent" ignore_missing_imports = true exclude = "(resources/.*)" plugins = [ "pydantic.mypy" ] warn_redundant_casts = true warn_unused_ignores = true disallow_any_generics = true check_untyped_defs = true no_implicit_reexport = true # for strict mypy: (this is the tricky one :-)) disallow_untyped_defs = true [tool.pydantic-mypy] init_forbid_extra = true init_typed = true warn_required_dynamic_aliases = true warn_untyped_fields = true ``` Using that config, I found an internal error while running mypy ``` src/app/models/stages.py:152: error: INTERNAL ERROR -- Please try using mypy master on GitHub: https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build Please report a bug at https://github.com/python/mypy/issues version: 1.1.1 Traceback (most recent call last): File "mypy/semanal.py", line 6261, in accept File "mypy/nodes.py", line 1123, in accept File "mypy/semanal.py", line 1561, in visit_class_def File "mypy/semanal.py", line 1641, in analyze_class File "mypy/semanal.py", line 1668, in analyze_class_body_common File "mypy/semanal.py", line 1751, in apply_class_plugin_hooks File "pydantic/mypy.py", line 150, in pydantic.mypy.PydanticPlugin._pydantic_model_class_maker_callback File "pydantic/mypy.py", line 315, in pydantic.mypy.PydanticModelTransformer.transform File "pydantic/mypy.py", line 524, in pydantic.mypy.PydanticModelTransformer.set_frozen AssertionError: src/app/models/stages.py:152: : note: use --pdb to drop into pdb ``` If remove the `explicit_package_bases` configuration, mypy is able to run without this setting. mypy version: ``` name : mypy version : 1.1.1 description : Optional static typing for Python dependencies - mypy-extensions >=1.0.0 - tomli >=1.1.0 - typing-extensions >=3.10 ``` ### Example Code _No response_ ### Python, Pydantic & OS Version ```Text pydantic version: 1.10.6 pydantic compiled: True install path: /workspace/.venv/lib/python3.9/site-packages/pydantic python version: 3.9.16 (main, Jan 11 2023, 15:55:30) [GCC 10.2.1 20210110] platform: Linux-5.10.102.1-microsoft-standard-WSL2-x86_64-with-glibc2.31 optional deps. installed: ['typing-extensions'] ``` ### Affected Components - [ ] [Compatibility between releases](https://docs.pydantic.dev/changelog/) - [ ] [Data validation/parsing](https://docs.pydantic.dev/usage/models/#basic-model-usage) - [ ] [Data serialization](https://docs.pydantic.dev/usage/exporting_models/) - `.dict()` and `.json()` - [ ] [JSON Schema](https://docs.pydantic.dev/usage/schema/) - [ ] [Dataclasses](https://docs.pydantic.dev/usage/dataclasses/) - [ ] [Model Config](https://docs.pydantic.dev/usage/model_config/) - [ ] [Field Types](https://docs.pydantic.dev/usage/types/) - adding or changing a particular data type - [ ] [Function validation decorator](https://docs.pydantic.dev/usage/validation_decorator/) - [ ] [Generic Models](https://docs.pydantic.dev/usage/models/#generic-models) - [ ] [Other Model behaviour](https://docs.pydantic.dev/usage/models/) - `construct()`, pickling, private attributes, ORM mode - [X] [Plugins](https://docs.pydantic.dev/) and integration with other tools - mypy, FastAPI, python-devtools, Hypothesis, VS Code, PyCharm, etc.
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      url:https://github.com/5191/pydantic/issues/5191
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