Add stricter linting and type checking

pyproject.toml

@@ -32,3 +32,54 @@ dev = [
 
 [tool.hatch.build.targets.wheel]
 packages = ["src"]
+
+[tool.ruff]
+line-length = 88
+target-version = "py39"
+
+[tool.ruff.lint]
+select = [
+    "E",      # pycodestyle errors
+    "W",      # pycodestyle warnings  
+    "F",      # pyflakes
+    "I",      # isort
+    "B",      # flake8-bugbear
+    "C4",     # flake8-comprehensions
+    "UP",     # pyupgrade
+    "TID",    # flake8-tidy-imports
+    "E402",   # module-import-not-at-top-of-file
+    "N",      # pep8-naming
+    "S",      # flake8-bandit
+    "PTH",    # flake8-use-pathlib
+    "RUF",    # ruff-specific rules
+    "ICN",    # flake8-import-conventions
+]
+
+ignore = [
+    "E501",   # line too long (handled by line-length)
+    "TID252", # prefer absolute imports (keep relative for internal imports)
+    "S101",   # assert used (acceptable in tests)
+]
+
+[tool.ruff.lint.flake8-tidy-imports]
+# Prevent specific problematic imports
+banned-api = {}
+
+[tool.ruff.lint.isort]
+known-first-party = ["python-collab-template"]
+
+[tool.mypy]
+python_version = "3.9"
+strict = true
+warn_return_any = true
+warn_unused_configs = true
+disallow_untyped_defs = true
+disallow_incomplete_defs = true
+check_untyped_defs = true
+disallow_untyped_decorators = true
+no_implicit_optional = true
+warn_redundant_casts = true
+warn_unused_ignores = true
+warn_no_return = true
+warn_unreachable = true
+strict_equality = true

scripts/init_project.py

@@ -195,6 +195,10 @@ def main() -> None:
     if "tool" in config and "hatch" in config["tool"] and "build" in config["tool"]["hatch"] and "targets" in config["tool"]["hatch"]["build"] and "wheel" in config["tool"]["hatch"]["build"]["targets"]:
         config["tool"]["hatch"]["build"]["targets"]["wheel"]["packages"] = [project_module_name]
 
+    # Update ruff known-first-party if ruff config exists
+    if "tool" in config and "ruff" in config["tool"] and "lint" in config["tool"]["ruff"] and "isort" in config["tool"]["ruff"]["lint"]:
+        config["tool"]["ruff"]["lint"]["isort"]["known-first-party"] = [project_module_name]
+
     with open(pyproject_path, "wb") as f:
         tomli_w.dump(config, f)
 

src/example.py

@@ -1,7 +1,7 @@
-from typing import List, Optional
 import statistics
 from dataclasses import dataclass
 from datetime import datetime
+from typing import Optional
 
 
 @dataclass
@@ -14,8 +14,8 @@ class DataPoint:
 
 
 def calculate_moving_average(
-    data: List[DataPoint], window_size: int = 3
-) -> List[float]:
+    data: list[DataPoint], window_size: int = 3
+) -> list[float]:
     """Calculate moving average of values.
 
     Args: