chore: moving python package to a subdirectory

It is needed to prevent import errors as the repo root sometimes gets
into the PYTHONPATH, e.g. when python interactive is used. In that
case the native extension may not be loadable.

See also PyO3/maturin#490

Author: vlaci

flake.nix

@@ -91,7 +91,7 @@
                 "Cargo.toml"
                 "Cargo.lock"
                 "pyproject.toml"
-                "unblob_native"
+                "python"
                 "benches"
                 "src"
                 "README.md"

pyproject.toml

@@ -41,6 +41,7 @@ build-backend = "maturin"
 
 [tool.maturin]
 module-name = "unblob_native._native"
+python-source = "python"
 
 features = [
   "pyo3/extension-module",  # This is an extension module
@@ -92,7 +93,7 @@ ignore = [
 ]
 
 [tool.ruff.per-file-ignores]
-"unblob_native/__init__.py" = [
+"python/unblob_native/__init__.py" = [
   "F403",
   "A001",
   "F405",
@@ -103,6 +104,9 @@ ignore = [
   "S101",    # assert:                         Enable usage of asserts
 ]
 
+[tool.ruff.isort]
+known-first-party = ["unblob_native"]
+
 [tool.ruff.flake8-pytest-style]
 fixture-parentheses = false
 mark-parentheses = false