Fix handling of strict argument in Python 3.9.23

- had been backported together with ALLOW_MISSING

-

Author: mrbean-bremen

CHANGES.md

@@ -13,6 +13,11 @@ The released versions correspond to PyPI releases.
   the real filesystem behavior
 * remove support for Python versions before 3.10 (if needed, patches may be backported to the 5.x branch)
 
+## Unreleased
+
+### Fixes
+* fixed handling of added `strict` argument in Python 3.9.23
+
 ## [Version 5.9.0](https://pypi.python.org/pypi/pyfakefs/5.8.0) (2025-06-21)
 Adds support for an API change in latest Python patch releases.
 

pyfakefs/fake_path.py

@@ -359,9 +359,11 @@ def realpath(self, filename: AnyStr, strict: Optional[bool] = None) -> AnyStr:
         """Return the canonical path of the specified filename, eliminating any
         symbolic links encountered in the path.
         """
-        if strict is not None and sys.version_info < (3, 10):
-            raise TypeError("realpath() got an unexpected keyword argument 'strict'")
         has_allow_missing = hasattr(os.path, "ALLOW_MISSING")
+        # the strict argument was backported to Python 3.9.23
+        # together with support for os.path.ALLOW_MISSING
+        if strict is not None and sys.version_info < (3, 10) and not has_allow_missing:
+            raise TypeError("realpath() got an unexpected keyword argument 'strict'")
         if has_allow_missing and strict == os.path.ALLOW_MISSING:  # type: ignore[attr-defined]
             # ignores non-existing file, but not other errors
             ignored_error: Any = FileNotFoundError