style: add pre-commit and new checks

.pre-commit-config.yaml

@@ -0,0 +1,89 @@
+ci:
+  autoupdate_commit_msg: "chore: update pre-commit hooks"
+  autofix_commit_msg: "style: pre-commit fixes"
+
+repos:
+- repo: https://github.com/psf/black
+  rev: 21.12b0
+  hooks:
+  - id: black
+
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v4.0.1
+  hooks:
+  - id: check-added-large-files
+  - id: check-case-conflict
+  - id: check-merge-conflict
+  - id: check-symlinks
+  - id: check-yaml
+  - id: debug-statements
+  - id: end-of-file-fixer
+  - id: mixed-line-ending
+  - id: requirements-txt-fixer
+  - id: trailing-whitespace
+
+- repo: https://github.com/asottile/pyupgrade
+  rev: v2.29.1
+  hooks:
+  - id: pyupgrade
+    args: [--py36-plus]
+
+- repo: https://github.com/PyCQA/isort
+  rev: 5.10.1
+  hooks:
+  - id: isort
+
+- repo: https://github.com/asottile/setup-cfg-fmt
+  rev: v1.20.0
+  hooks:
+  - id: setup-cfg-fmt
+
+- repo: https://github.com/hadialqattan/pycln
+  rev: v1.1.0
+  hooks:
+  - id: pycln
+    args: [--config=pyproject.toml]
+
+- repo: https://github.com/asottile/yesqa
+  rev: v1.3.0
+  hooks:
+  - id: yesqa
+    additional_dependencies: &flake8-dependencies
+    - flake8-bugbear
+
+- repo: https://github.com/pycqa/flake8
+  rev: 4.0.1
+  hooks:
+  - id: flake8
+    exclude: docs/conf.py
+    additional_dependencies: *flake8-dependencies
+
+- repo: https://github.com/pre-commit/mirrors-mypy
+  rev: v0.920
+  hooks:
+  - id: mypy
+    files: ^nox/
+    args: [--show-error-codes]
+    additional_dependencies:
+    - types-jinja2
+    - packaging
+    - importlib_metadata
+
+- repo: https://github.com/codespell-project/codespell
+  rev: v2.1.0
+  hooks:
+  - id: codespell
+
+- repo: https://github.com/pre-commit/pygrep-hooks
+  rev: v1.9.0
+  hooks:
+  - id: python-check-blanket-noqa
+  - id: python-check-blanket-type-ignore
+  - id: python-no-log-warn
+    exclude: ^tests/test_sessions.py$
+  - id: python-no-eval
+    exclude: ^nox/manifest.py$
+  - id: python-use-type-annotations
+  - id: rst-backticks
+  - id: rst-directive-colons
+  - id: rst-inline-touching-normal

CONTRIBUTING.md

@@ -54,4 +54,4 @@ If you've contributed to Nox, you can get a cute little Nox sticker. Reach out t
 
 ## Getting paid
 
-Contributions to Nox can be expensed through [our Open Collective](https://opencollective.com/python-nox). The maintainers will let you know when and for how much you can expense contributions, but always feel free to ask. 
+Contributions to Nox can be expensed through [our Open Collective](https://opencollective.com/python-nox). The maintainers will let you know when and for how much you can expense contributions, but always feel free to ask.

docs/_static/custom.css

@@ -120,7 +120,7 @@ div.footer::before {
 
 div.footer {
     text-align: center;
-    color: #029be2; 
+    color: #029be2;
 }
 
 div.footer a {

docs/conf.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 #
 # nox documentation build configuration file, created by
 # sphinx-quickstart on Sun Feb 28 00:05:25 2016.

docs/cookbook.rst

@@ -40,7 +40,7 @@ Enter the ``dev`` nox session:
 .. code-block:: python
 
     import os
-    
+
     import nox
 
     # It's a good idea to keep your dev session out of the default list
@@ -91,7 +91,7 @@ Even more so with a sprinkling of Nox:
         Kicks off an automated release process by creating and pushing a new tag.
 
         Invokes bump2version with the posarg setting the version.
-        
+
         Usage:
         $ nox -s release -- [major|minor|patch]
         """
@@ -126,4 +126,4 @@ Even more so with a sprinkling of Nox:
         session.run("git", "push", external=True)
         session.run("git", "push", "--tags", external=True)
 
-Now a simple ``nox -s release -- patch`` will automate your release (provided you have Bump2Version set up to change your files). This is especially powerful if you have a CI/CD pipeline set up!
+Now a simple ``nox -s release -- patch`` will automate your release (provided you have Bump2Version set up to change your files). This is especially powerful if you have a CI/CD pipeline set up!

docs/tutorial.rst

@@ -273,7 +273,7 @@ If you want to queue up (or "notify") another session from the current one, you
         session.install("pytest")
         session.run("pytest")
         # Here we queue up the test coverage session to run next
-        session.notify("coverage") 
+        session.notify("coverage")
 
     @nox.session
     def coverage(session):

docs/usage.rst

@@ -128,7 +128,7 @@ Note that using this option does not change the backend for sessions where ``ven
 Forcing the sessions backend
 ----------------------------
 
-You might work in a different environment than a project's default continuous integration setttings, and might wish to get a quick way to execute the same tasks but on a different venv backend. For this purpose, you can temporarily force the backend used by **all** sessions in the current nox execution by using ``-fb <backend>`` or ``--force-venv-backend <backend>``. No exceptions are made, the backend will be forced for all sessions run whatever the other options values and nox file configuration. Supported names are ``('none', 'virtualenv', 'conda', 'venv')``.
+You might work in a different environment than a project's default continuous integration settings, and might wish to get a quick way to execute the same tasks but on a different venv backend. For this purpose, you can temporarily force the backend used by **all** sessions in the current nox execution by using ``-fb <backend>`` or ``--force-venv-backend <backend>``. No exceptions are made, the backend will be forced for all sessions run whatever the other options values and nox file configuration. Supported names are ``('none', 'virtualenv', 'conda', 'venv')``.
 
 .. code-block:: console
 

nox/_decorators.py

@@ -35,14 +35,14 @@ def __new__(
 def _copy_func(src: Callable, name: Optional[str] = None) -> Callable:
     dst = types.FunctionType(
         src.__code__,
-        src.__globals__,  # type: ignore
+        src.__globals__,  # type: ignore[attr-defined]
         name=name or src.__name__,
-        argdefs=src.__defaults__,  # type: ignore
-        closure=src.__closure__,  # type: ignore
+        argdefs=src.__defaults__,  # type: ignore[attr-defined]
+        closure=src.__closure__,  # type: ignore[attr-defined]
     )
     dst.__dict__.update(copy.deepcopy(src.__dict__))
     dst = functools.update_wrapper(dst, src)
-    dst.__kwdefaults__ = src.__kwdefaults__  # type: ignore
+    dst.__kwdefaults__ = src.__kwdefaults__  # type: ignore[attr-defined]
     return dst
 
 

nox/_option_set.py

@@ -191,12 +191,10 @@ class OptionSet:
     def __init__(self, *args: Any, **kwargs: Any) -> None:
         self.parser_args = args
         self.parser_kwargs = kwargs
-        self.options = (
+        self.options: "collections.OrderedDict[str, Option]" = collections.OrderedDict()
+        self.groups: "collections.OrderedDict[str, OptionGroup]" = (
             collections.OrderedDict()
-        )  # type: collections.OrderedDict[str, Option]
-        self.groups = (
-            collections.OrderedDict()
-        )  # type: collections.OrderedDict[str, OptionGroup]
+        )
 
     def add_options(self, *args: Option) -> None:
         """Adds a sequence of Options to the OptionSet.
@@ -242,8 +240,8 @@ def parser(self) -> ArgumentParser:
             argument = groups[option.group.name].add_argument(
                 *option.flags, help=option.help, default=option.default, **option.kwargs
             )
-            if getattr(option, "completer"):
-                setattr(argument, "completer", option.completer)
+            if option.completer:
+                argument.completer = option.completer  # type: ignore[attr-defined]
 
         return parser
 

nox/_parametrize.py

@@ -81,7 +81,7 @@ def __eq__(self, other: object) -> bool:
 def _apply_param_specs(param_specs: List[Param], f: Any) -> Any:
     previous_param_specs = getattr(f, "parametrize", None)
     new_param_specs = update_param_specs(previous_param_specs, param_specs)
-    setattr(f, "parametrize", new_param_specs)
+    f.parametrize = new_param_specs
     return f
 
 
@@ -119,7 +119,7 @@ def parametrize_decorator(
 
     # If there's only one arg_name, arg_values_list should be a single item
     # or list. Transform it so it'll work with the combine step.
-    _arg_values_list = []  # type: List[Union[Param, Iterable[Union[Any, ArgValue]]]]
+    _arg_values_list: List[Union[Param, Iterable[Union[Any, ArgValue]]]] = []
     if len(arg_names) == 1:
         # In this case, the arg_values_list can also just be a single item.
         # Must be mutable for the transformation steps
@@ -141,7 +141,7 @@ def parametrize_decorator(
         ids = []
 
     # Generate params for each item in the param_args_values list.
-    param_specs = []  # type: List[Param]
+    param_specs: List[Param] = []
     for param_arg_values, param_id in itertools.zip_longest(_arg_values_list, ids):
         if isinstance(param_arg_values, Param):
             param_spec = param_arg_values

nox/_version.py

@@ -36,7 +36,7 @@ class InvalidVersionSpecifier(Exception):
 
 def get_nox_version() -> str:
     """Return the version of the installed Nox package."""
-    return metadata.version("nox")  # type: ignore
+    return metadata.version("nox")  # type: ignore[no-untyped-call]
 
 
 def _parse_string_constant(node: ast.AST) -> Optional[str]:  # pragma: no cover

nox/command.py

@@ -32,7 +32,7 @@ class CommandFailed(Exception):
     """Raised when an executed command returns a non-success status code."""
 
     def __init__(self, reason: Optional[str] = None) -> None:
-        super(CommandFailed, self).__init__(reason)
+        super().__init__(reason)
         self.reason = reason
 
 

nox/logger.py

@@ -71,7 +71,7 @@ def format(self, record: Any) -> str:
         return super().format(record)
 
 
-class LoggerWithSuccessAndOutput(logging.getLoggerClass()):  # type: ignore
+class LoggerWithSuccessAndOutput(logging.getLoggerClass()):  # type: ignore[misc]
     def __init__(self, name: str, level: int = logging.NOTSET):
         super().__init__(name, level)
         logging.addLevelName(SUCCESS, "SUCCESS")

nox/manifest.py

@@ -65,11 +65,11 @@ def __init__(
         global_config: argparse.Namespace,
         module_docstring: Optional[str] = None,
     ) -> None:
-        self._all_sessions = []  # type: List[SessionRunner]
-        self._queue = []  # type: List[SessionRunner]
-        self._consumed = []  # type: List[SessionRunner]
-        self._config = global_config  # type: argparse.Namespace
-        self.module_docstring = module_docstring  # type: Optional[str]
+        self._all_sessions: List[SessionRunner] = []
+        self._queue: List[SessionRunner] = []
+        self._consumed: List[SessionRunner] = []
+        self._config: argparse.Namespace = global_config
+        self.module_docstring: Optional[str] = module_docstring
 
         # Create the sessions based on the provided session functions.
         for name, func in session_functions.items():
@@ -217,7 +217,7 @@ def make_session(
         if self._config.extra_pythons:
             # If extra python is provided, expand the func.python list to
             # include additional python interpreters
-            extra_pythons = self._config.extra_pythons  # type: List[str]
+            extra_pythons: List[str] = self._config.extra_pythons
             if isinstance(func.python, (list, tuple, set)):
                 func.python = _unique_list(*func.python, *extra_pythons)
             elif not multi and func.python:
@@ -253,7 +253,7 @@ def make_session(
 
         # Since this function is parametrized, we need to add a distinct
         # session for each permutation.
-        parametrize = func.parametrize  # type: ignore
+        parametrize = func.parametrize  # type: ignore[attr-defined]
         calls = Call.generate_calls(func, parametrize)
         for call in calls:
             long_names = []

nox/py.typed

@@ -1 +1 @@
-# Marker file for PEP 561.  The nox package uses inline types.
+# Marker file for PEP 561.  The nox package uses inline types.

nox/registry.py

@@ -22,7 +22,7 @@
 
 F = TypeVar("F", bound=Callable[..., Any])
 
-_REGISTRY = collections.OrderedDict()  # type: collections.OrderedDict[str, Func]
+_REGISTRY: "collections.OrderedDict[str, Func]" = collections.OrderedDict()
 
 
 @overload

nox/sessions.py

@@ -128,7 +128,7 @@ def __init__(self, runner: "SessionRunner") -> None:
         self._runner = runner
 
     @property
-    def __dict__(self) -> "Dict[str, SessionRunner]":  # type: ignore
+    def __dict__(self) -> "Dict[str, SessionRunner]":  # type: ignore[override]
         """Attribute dictionary for object inspection.
 
         This is needed because ``__slots__`` turns off ``__dict__`` by
@@ -411,7 +411,7 @@ def conda_install(
         """
         venv = self._runner.venv
 
-        prefix_args = ()  # type: Tuple[str, ...]
+        prefix_args: Tuple[str, ...] = ()
         if isinstance(venv, CondaEnv):
             prefix_args = ("--prefix", venv.location)
         elif not isinstance(venv, PassthroughEnv):  # pragma: no cover
@@ -431,7 +431,7 @@ def conda_install(
         if "silent" not in kwargs:
             kwargs["silent"] = True
 
-        extraopts = []  # type: List[str]
+        extraopts: List[str] = []
         if auto_offline and venv.is_offline():
             logger.warning(
                 "Automatically setting the `--offline` flag as conda repo seems unreachable."
@@ -612,22 +612,22 @@ def _create_venv(self) -> None:
         if backend is None or backend == "virtualenv":
             self.venv = VirtualEnv(
                 self.envdir,
-                interpreter=self.func.python,  # type: ignore
+                interpreter=self.func.python,  # type: ignore[arg-type]
                 reuse_existing=reuse_existing,
                 venv_params=self.func.venv_params,
             )
         elif backend in {"conda", "mamba"}:
             self.venv = CondaEnv(
                 self.envdir,
-                interpreter=self.func.python,  # type: ignore
+                interpreter=self.func.python,  # type: ignore[arg-type]
                 reuse_existing=reuse_existing,
                 venv_params=self.func.venv_params,
                 conda_cmd=backend,
             )
         elif backend == "venv":
             self.venv = VirtualEnv(
                 self.envdir,
-                interpreter=self.func.python,  # type: ignore
+                interpreter=self.func.python,  # type: ignore[arg-type]
                 reuse_existing=reuse_existing,
                 venv=True,
                 venv_params=self.func.venv_params,