dangotbanned commented on code in PR #47609:
URL: https://github.com/apache/arrow/pull/47609#discussion_r2426774911


##########
python/pyproject.toml:
##########
@@ -83,11 +83,61 @@ include = ["pyarrow"]
 namespaces = false
 
 [tool.setuptools.package-data]
-pyarrow = ["*.pxd", "*.pyx", "includes/*.pxd"]
+pyarrow = ["*.pxd", "*.pyx", "includes/*.pxd", "py.typed"]
 
 [tool.setuptools_scm]
 root = '..'
 version_file = 'pyarrow/_generated_version.py'
 version_scheme = 'guess-next-dev'
 git_describe_command = 'git describe --dirty --tags --long --match 
"apache-arrow-[0-9]*.*"'
 fallback_version = '22.0.0a0'
+
+[tool.mypy]
+files = ["pyarrow"]
+exclude = 'pyarrow/interchange/.*|pyarrow/vendored/.*'
+mypy_path = "$MYPY_CONFIG_FILE_DIR/pyarrow-stubs"
+
+[tool.pyright]
+include = ["pyarrow"]

Review Comment:
   > Please do advise if some of these could be kept disabled. :)
   
   Sure thing, here's [our current 
config](https://github.com/narwhals-dev/narwhals/blob/849326f7682ac741b3bad4edca775cec79fe11f3/pyproject.toml#L349-L365)
   
   <details><summary>Details</summary>
   <p>
   
   ```toml
   [tool.pyright]
   pythonPlatform = "All"
   # NOTE (`pyarrow-stubs` do unsafe `TypeAlias` and `TypeVar` imports)
   # pythonVersion = "3.9"
   reportMissingTypeArgument = "error"
   reportIncompatibleMethodOverride = "error"
   reportMissingImports = "none"
   reportMissingModuleSource = "none"
   reportPrivateImportUsage = "none"
   reportUnusedExpression = "none"    # handled by 
(https://docs.astral.sh/ruff/rules/unused-variable/)
   typeCheckingMode = "basic"
   include = ["narwhals", "tests"]
   ignore = [
     "../.venv/",
     "../../../**/Lib",      # stdlib
     "../../../**/typeshed*" # typeshed-fallback
   ]
   
   ```
   
   </p>
   </details> 
   
   And some other rules I was thinking of disabling to allow us to switch 
`typeCheckingMode = "basic"` -> `"strict"`
   
   - https://github.com/narwhals-dev/narwhals/issues/3103
   
   



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