chore: some refurb suggestions and cleanup old Python 2-3.6 stuff

nox/_decorators.py

@@ -18,11 +18,11 @@
 import functools
 import inspect
 import types
-from typing import Any, Callable, Iterable, TypeVar, cast
+from typing import TYPE_CHECKING, Any, Callable, Iterable, TypeVar, cast
 
 from . import _typing
 
-if _typing.TYPE_CHECKING:
+if TYPE_CHECKING:
     from ._parametrize import Param
 
 
@@ -68,7 +68,7 @@ def __init__(
         self.reuse_venv = reuse_venv
         self.venv_backend = venv_backend
         self.venv_params = venv_params
-        self.should_warn = should_warn or dict()
+        self.should_warn = should_warn or {}
         self.tags = tags or []
 
     def __call__(self, *args: Any, **kwargs: Any) -> Any:

nox/_option_set.py

@@ -237,7 +237,7 @@ def parser(self) -> ArgumentParser:
         }
 
         for option in self.options.values():
-            if option.hidden is True:
+            if option.hidden:
                 continue
 
             # Every option must have a group (except for hidden options)

nox/_options.py

@@ -157,15 +157,15 @@ def _color_finalizer(value: bool, args: argparse.Namespace) -> bool:
     Returns:
         The new value for the "color" option.
     """
-    if args.forcecolor is True and args.nocolor is True:
+    if args.forcecolor and args.nocolor:
         raise _option_set.ArgumentError(
             None, "Can not specify both --no-color and --force-color."
         )
 
-    if args.forcecolor is True:
+    if args.forcecolor:
         return True
 
-    if args.nocolor is True:
+    if args.nocolor:
         return False
 
     return sys.stdout.isatty()
@@ -510,7 +510,7 @@ def _session_completer(
         "invoked_from",
         group=None,
         hidden=True,
-        default=lambda: os.getcwd(),
+        default=os.getcwd,
     ),
 )
 

nox/_parametrize.py

@@ -36,7 +36,7 @@ def __init__(
         arg_names: Sequence[str] | None = None,
         id: str | None = None,
     ) -> None:
-        self.args = tuple(args)
+        self.args = args
         self.id = id
 
         if arg_names is None:

nox/_typing.py

@@ -14,33 +14,8 @@
 
 from __future__ import annotations
 
-__all__ = ["TYPE_CHECKING", "ClassVar", "NoReturn", "Python"]
+__all__ = ["Python"]
 
-import typing as _typing
+from typing import Sequence, Union
 
-try:
-    from typing import TYPE_CHECKING
-except ImportError:
-    try:
-        from typing import TYPE_CHECKING
-    except ImportError:
-        TYPE_CHECKING = False
-
-try:
-    from typing import NoReturn
-except ImportError:
-    try:
-        from typing import NoReturn
-    except ImportError:
-        pass
-
-
-try:
-    from typing import ClassVar
-except ImportError:
-    try:
-        from typing import ClassVar
-    except ImportError:
-        pass
-
-Python = _typing.Optional[_typing.Union[str, _typing.Sequence[str], bool]]
+Python = Union[str, Sequence[str], bool, None]

nox/logger.py

@@ -97,7 +97,7 @@ def output(self, msg: str, *args: Any, **kwargs: Any) -> None:
 
 
 def _get_formatter(color: bool, add_timestamp: bool) -> logging.Formatter:
-    if color is True:
+    if color:
         return NoxColoredFormatter(
             reset=True,
             log_colors={
@@ -112,8 +112,7 @@ def _get_formatter(color: bool, add_timestamp: bool) -> logging.Formatter:
             secondary_log_colors=None,
             add_timestamp=add_timestamp,
         )
-    else:
-        return NoxFormatter(add_timestamp=add_timestamp)
+    return NoxFormatter(add_timestamp=add_timestamp)
 
 
 def setup_logging(

nox/sessions.py

@@ -24,15 +24,23 @@
 import sys
 import unicodedata
 from types import TracebackType
-from typing import Any, Callable, Generator, Iterable, Mapping, Sequence
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Callable,
+    Generator,
+    Iterable,
+    Mapping,
+    NoReturn,
+    Sequence,
+)
 
 import nox.command
-from nox import _typing
 from nox._decorators import Func
 from nox.logger import logger
 from nox.virtualenv import CondaEnv, PassthroughEnv, ProcessEnv, VirtualEnv
 
-if _typing.TYPE_CHECKING:
+if TYPE_CHECKING:
     from nox.manifest import Manifest
 
 
@@ -89,7 +97,7 @@ def _dblquote_pkg_install_arg(pkg_req_str: str) -> str:
             )
 
         if "<" in pkg_req_str or ">" in pkg_req_str:
-            if pkg_req_str[0] == '"' and pkg_req_str[-1] == '"':
+            if pkg_req_str[0] == pkg_req_str[-1] == '"':
                 # already double-quoted string
                 return pkg_req_str
             else:
@@ -646,11 +654,11 @@ def debug(self, *args: Any, **kwargs: Any) -> None:
         """Outputs a debug-level message during the session."""
         logger.debug(*args, **kwargs)
 
-    def error(self, *args: Any) -> _typing.NoReturn:
+    def error(self, *args: Any) -> NoReturn:
         """Immediately aborts the session and optionally logs an error."""
         raise _SessionQuit(*args)
 
-    def skip(self, *args: Any) -> _typing.NoReturn:
+    def skip(self, *args: Any) -> NoReturn:
         """Immediately skips the session and optionally logs a warning."""
         raise _SessionSkip(*args)
 
@@ -817,11 +825,12 @@ def imperfect(self) -> str:
         """
         if self.status == Status.SUCCESS:
             return "was successful"
+
         status = self.status.name.lower()
         if self.reason:
             return f"{status}: {self.reason}"
-        else:
-            return status
+
+        return status
 
     def log(self, message: str) -> None:
         """Log a message using the appropriate log function.

nox/virtualenv.py

@@ -14,18 +14,18 @@
 
 from __future__ import annotations
 
+import contextlib
 import os
 import platform
 import re
 import shutil
 import subprocess
 import sys
 from socket import gethostbyname
-from typing import Any, Mapping
+from typing import Any, ClassVar, Mapping
 
 import nox
 import nox.command
-from nox import _typing
 from nox.logger import logger
 
 # Problematic environment variables that are stripped from all commands inside
@@ -52,7 +52,7 @@ class ProcessEnv:
     is_sandboxed = False
 
     # Special programs that aren't included in the environment.
-    allowed_globals: _typing.ClassVar[tuple[Any, ...]] = ()
+    allowed_globals: ClassVar[tuple[Any, ...]] = ()
 
     def __init__(
         self, bin_paths: None = None, env: Mapping[str, str] | None = None
@@ -207,7 +207,7 @@ def __init__(
         self.location = os.path.abspath(location)
         self.interpreter = interpreter
         self.reuse_existing = reuse_existing
-        self.venv_params = venv_params if venv_params else []
+        self.venv_params = venv_params or []
         self.conda_cmd = conda_cmd
         super().__init__(env={"CONDA_PREFIX": self.location})
 
@@ -227,10 +227,8 @@ def _clean_location(self) -> bool:
                 ]
                 nox.command.run(cmd, silent=True, log=False)
                 # Make sure that location is clean
-                try:
+                with contextlib.suppress(FileNotFoundError):
                     shutil.rmtree(self.location)
-                except FileNotFoundError:
-                    pass
 
         return True
 
@@ -247,8 +245,8 @@ def bin_paths(self) -> list[str]:
                 os.path.join(self.location, "Scripts"),
                 os.path.join(self.location, "bin"),
             ]
-        else:
-            return [os.path.join(self.location, "bin")]
+
+        return [os.path.join(self.location, "bin")]
 
     def create(self) -> bool:
         """Create the conda env."""
@@ -332,7 +330,7 @@ def __init__(
         self._resolved: None | str | InterpreterNotFound = None
         self.reuse_existing = reuse_existing
         self.venv_or_virtualenv = "venv" if venv else "virtualenv"
-        self.venv_params = venv_params if venv_params else []
+        self.venv_params = venv_params or []
         super().__init__(env={"VIRTUAL_ENV": self.location})
 
     def _clean_location(self) -> bool:
@@ -465,8 +463,7 @@ def bin_paths(self) -> list[str]:
         """Returns the location of the virtualenv's bin folder."""
         if _SYSTEM == "Windows":
             return [os.path.join(self.location, "Scripts")]
-        else:
-            return [os.path.join(self.location, "bin")]
+        return [os.path.join(self.location, "bin")]
 
     def create(self) -> bool:
         """Create the virtualenv or venv."""

pyproject.toml

@@ -76,7 +76,7 @@ branch = true
 omit = [ "nox/_typing.py" ]
 
 [tool.coverage.report]
-exclude_lines = [ "pragma: no cover", "if _typing.TYPE_CHECKING:", "@overload" ]
+exclude_lines = [ "pragma: no cover", "if TYPE_CHECKING:", "@overload" ]
 
 [tool.pytest.ini_options]
 minversion = "6.0"