Revert "[BE] Update Python min version to 3.10 (pytorch#162310)"

This reverts commit 3016616.

Reverted pytorch#162310 on behalf of https://github.com/malfet due to Breaks some windows tests ([comment](pytorch#162862 (comment)))

Author: pytorchmergebot

pyproject.toml

@@ -53,7 +53,7 @@ dev = [
 name = "torch"
 description = "Tensors and Dynamic neural networks in Python with strong GPU acceleration"
 readme = "README.md"
-requires-python = ">=3.10"
+requires-python = ">=3.9"
 # TODO: change to `license = "BSD-3-Clause"` and enable PEP 639 after pinning setuptools>=77
 # FIXME: As of 2025.06.20, it is hard to ensure the minimum version of setuptools in our CI environment.
 # TOML-table-based license deprecated in setuptools>=77, and the deprecation warning will be changed
@@ -74,6 +74,7 @@ classifiers = [
     "Topic :: Software Development :: Libraries :: Python Modules",
     "Programming Language :: C++",
     "Programming Language :: Python :: 3 :: Only",
+    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",

setup.py

@@ -256,7 +256,7 @@
 
 
 # Also update `project.requires-python` in pyproject.toml when changing this
-python_min_version = (3, 10, 0)
+python_min_version = (3, 9, 0)
 python_min_version_str = ".".join(map(str, python_min_version))
 if sys.version_info < python_min_version:
     print(
@@ -1029,7 +1029,7 @@ def build_deps() -> None:
         CWD / "third_party/valgrind-headers/callgrind.h",
         CWD / "third_party/valgrind-headers/valgrind.h",
     ]
-    for sym_file, orig_file in zip(sym_files, orig_files, strict=True):
+    for sym_file, orig_file in zip(sym_files, orig_files):
         same = False
         if sym_file.exists():
             if filecmp.cmp(sym_file, orig_file):