prefer sys.platform over os.name when checking for windows OS

pre_commit/languages/conda.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import contextlib
 import os
+import sys
 from typing import Generator
 from typing import Sequence
 
@@ -26,7 +27,7 @@ def get_env_patch(env: str) -> PatchesT:
     # $CONDA_PREFIX/Scripts and $CONDA_PREFIX. Whereas the latter only
     # seems to be used for python.exe.
     path: SubstitutionT = (os.path.join(env, 'bin'), os.pathsep, Var('PATH'))
-    if os.name == 'nt':  # pragma: no cover (platform specific)
+    if sys.platform == 'win32':  # pragma: win32 cover
         path = (env, os.pathsep, *path)
         path = (os.path.join(env, 'Scripts'), os.pathsep, *path)
         path = (os.path.join(env, 'Library', 'bin'), os.pathsep, *path)

pre_commit/languages/python.py

@@ -48,7 +48,7 @@ def _read_pyvenv_cfg(filename: str) -> dict[str, str]:
 
 def bin_dir(venv: str) -> str:
     """On windows there's a different directory for the virtualenv"""
-    bin_part = 'Scripts' if os.name == 'nt' else 'bin'
+    bin_part = 'Scripts' if sys.platform == 'win32' else 'bin'
     return os.path.join(venv, bin_part)
 
 
@@ -137,7 +137,7 @@ def norm_version(version: str) -> str | None:
     elif _sys_executable_matches(version):  # virtualenv defaults to our exe
         return None
 
-    if os.name == 'nt':  # pragma: no cover (windows)
+    if sys.platform == 'win32':  # pragma: no cover (windows)
         version_exec = _find_by_py_launcher(version)
         if version_exec:
             return version_exec

pre_commit/util.py

@@ -119,7 +119,7 @@ def cmd_output(*cmd: str, **kwargs: Any) -> tuple[int, str, str | None]:
     return returncode, stdout, stderr
 
 
-if os.name != 'nt':  # pragma: win32 no cover
+if sys.platform != 'win32':  # pragma: win32 no cover
     from os import openpty
     import termios