feat: update code from upstream 3.14.3

Author: Rogdham

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/), and this project
 adheres to [Semantic Versioning](https://semver.org/).
 
+## Unreleased
+
+### :rocket: Added
+
+- Update code with CPython 3.14.3 version
+
 ## [1.3.0] - 2025-12-29
 
 [1.3.0]: https://github.com/rogdham/backports.zstd/releases/tag/v1.3.0

tests/test/support/__init__.py

@@ -30,7 +30,8 @@
     "record_original_stdout", "get_original_stdout", "captured_stdout",
     "captured_stdin", "captured_stderr", "captured_output",
     # unittest
-    "is_resource_enabled", "requires", "requires_freebsd_version",
+    "is_resource_enabled", "get_resource_value", "requires", "requires_resource",
+    "requires_freebsd_version",
     "requires_gil_enabled", "requires_linux_version", "requires_mac_ver",
     "check_syntax_error",
     "requires_gzip", "requires_bz2", "requires_lzma", "requires_zstd",
@@ -43,6 +44,7 @@
     "check__all__", "skip_if_buggy_ucrt_strfptime",
     "check_disallow_instantiation", "check_sanitizer", "skip_if_sanitizer",
     "requires_limited_api", "requires_specialization", "thread_unsafe",
+    "skip_if_unlimited_stack_size",
     # sys
     "MS_WINDOWS", "is_jython", "is_android", "is_emscripten", "is_wasi",
     "is_apple_mobile", "check_impl_detail", "unix_shell", "setswitchinterval",
@@ -184,7 +186,7 @@ def get_attribute(obj, name):
         return attribute
 
 verbose = 1              # Flag set to 0 by regrtest.py
-use_resources = None     # Flag set to [] by regrtest.py
+use_resources = None     # Flag set to {} by regrtest.py
 max_memuse = 0           # Disable bigmem tests (they will still be run with
                          # small sizes, to make sure they work.)
 real_max_memuse = 0
@@ -299,6 +301,16 @@ def is_resource_enabled(resource):
     """
     return use_resources is None or resource in use_resources
 
+def get_resource_value(resource):
+    """Test whether a resource is enabled.
+
+    Known resources are set by regrtest.py.  If not running under regrtest.py,
+    all resources are assumed enabled unless use_resources has been set.
+    """
+    if use_resources is None:
+        return None
+    return use_resources.get(resource)
+
 def requires(resource, msg=None):
     """Raise ResourceDenied if the specified resource is not available."""
     if not is_resource_enabled(resource):
@@ -1669,6 +1681,25 @@ def skip_if_pgo_task(test):
     return test if ok else unittest.skip(msg)(test)
 
 
+def skip_if_unlimited_stack_size(test):
+    """Skip decorator for tests not run when an unlimited stack size is configured.
+
+    Tests using support.infinite_recursion([...]) may otherwise run into
+    an infinite loop, running until the memory on the system is filled and
+    crashing due to OOM.
+
+    See https://github.com/python/cpython/issues/143460.
+    """
+    if is_emscripten or is_wasi or os.name == "nt":
+        return test
+
+    import resource
+    curlim, maxlim = resource.getrlimit(resource.RLIMIT_STACK)
+    unlimited_stack_size_cond = curlim == maxlim and curlim in (-1, 0xFFFF_FFFF_FFFF_FFFF)
+    reason = "Not run due to unlimited stack size"
+    return unittest.skipIf(unlimited_stack_size_cond, reason)(test)
+
+
 def detect_api_mismatch(ref_api, other_api, *, ignore=()):
     """Returns the set of items in ref_api not in other_api, except for a
     defined list of items to be ignored in this check.
@@ -3184,3 +3215,10 @@ def linked_to_musl():
         return _linked_to_musl
     _linked_to_musl = tuple(map(int, version.split('.')))
     return _linked_to_musl
+
+
+def control_characters_c0() -> list[str]:
+    """Returns a list of C0 control characters as strings.
+    C0 control characters defined as the byte range 0x00-0x1F, and 0x7F.
+    """
+    return [chr(c) for c in range(0x00, 0x20)] + ["\x7F"]

tests/test/support/import_helper.py

@@ -305,8 +305,8 @@ def ready_to_import(name=None, source=""):
         try:
             sys.path.insert(0, tempdir)
             yield name, path
-            sys.path.remove(tempdir)
         finally:
+            sys.path.remove(tempdir)
             if old_module is not None:
                 sys.modules[name] = old_module
             else: