make mypy run properly, add pyproject.toml

py-rattler-build/README.md

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+# Python bindings to rattler-build

py-rattler-build/examples/basic.py

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+import rattler_build
+
+if __name__ == "__main__":
+    print(rattler_build.rattler_build_version())

py-rattler-build/pyproject.toml

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+[build-system]
+requires = ["maturin~=1.2.1"]
+build-backend = "maturin"
+
+[project]
+name = "py-rattler-build"
+requires-python = ">=3.8"
+description = "The fastest way to build conda packages programatically"
+readme = "README.md"
+authors = [
+    { name = "Wolf Vollprecht", email = "[email protected]" }
+]
+classifiers = [
+    "Development Status :: 3 - Alpha",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: BSD License",
+    "Programming Language :: Rust",
+    "Programming Language :: Python :: Implementation :: CPython",
+    "Programming Language :: Python :: Implementation :: PyPy",
+    "Typing :: Typed",
+]
+license = "BSD-3-Clause"
+
+[project.urls]
+Homepage = "https://github.com/prefix-dev/rattler-build"
+Repository = "https://github.com/prefix-dev/rattler-build"
+Issues = "https://github.com/prefix-dev/rattler-build/labels/python-bindings"
+
+[tool.maturin]
+features = ["pyo3/extension-module"]
+
+[tool.ruff]
+line-length = 120
+target-version = "py38"
+
+[tool.mypy]
+python_version = "3.8"
+files = ["rattler_build", "tests", "examples"]
+strict = true
+enable_error_code = ["redundant-expr", "truthy-bool", "ignore-without-code"]
+disable_error_code = ["empty-body"]
+
+[[tool.mypy.overrides]]
+module = ["rattler_build.rattler_build"]
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = ["rattler_build.*"]
+# We exclude the rattler module from warn_return_any, because the PyO3 api does not have Python
+# type annotations. See https://github.com/PyO3/pyo3/issues/1112 for a discussion on adding
+# this capability. We could add a stub file for rattler_build.rattler_build (the PyO3 api), but that
+# amounts to duplicating almost all type annotations on our api, as the Python api itself is a
+# thin wrapper around the PyO3 api to start with.
+warn_return_any = false