Fix(NameMapper): Fix mapping test

Python 3.13 brough a new mapping type `FrameLocalsProxy`.

Cheetah/NameMapper.py

@@ -212,9 +212,17 @@ def _isInstanceOrClass(obj):
     return False
 
 
+FrameLocalsProxyType = None
+
+
+def isMapping(obj):
+    return isinstance(obj, Mapping) \
+        or (FrameLocalsProxyType and isinstance(obj, FrameLocalsProxyType))
+
+
 def hasKey(obj, key):
     """Determine if 'obj' has 'key' """
-    if isinstance(obj, Mapping) and key in obj:
+    if isMapping(obj) and key in obj:
         return True
     elif hasattr(obj, key):
         return True
@@ -225,7 +233,7 @@ def hasKey(obj, key):
 def _valueForName(obj, name, executeCallables=False):
     nameChunks = name.split('.')
     for key in nameChunks:
-        if isinstance(obj, Mapping) and key in obj:
+        if isMapping(obj) and key in obj:
             nextObj = obj[key]
         else:
             try:
@@ -274,7 +282,7 @@ class NotFound(LookupError):
         pass
 
     def valueForKey(obj, key):
-        if isinstance(obj, Mapping) and key in obj:
+        if isMapping(obj) and key in obj:
             return obj[key]
         elif hasattr(obj, key):
             return getattr(obj, key)
@@ -319,6 +327,10 @@ def __valueForName():
         try:
             if not frame:
                 frame = inspect.stack()[1][0]
+            global FrameLocalsProxyType
+            if (FrameLocalsProxyType is None) \
+                    and (sys.version_info[:2] >= (3, 13)):
+                FrameLocalsProxyType = type(frame.f_locals)
             key = name.split('.')[0]
             for namespace in _namespaces(frame, searchList):
                 if hasKey(namespace, key):

docs/news.rst

@@ -12,6 +12,9 @@ Bug fixes:
   - Fixed ``_namemapper.c``: Silent an error
     from ``PyMapping_HasKeyString`` under Python 3.13+.
 
+  - Fixed mapping test in ``NameMapper.py``:
+    Python 3.13 brough a new mapping type ``FrameLocalsProxy``.
+
 Tests:
 
    - tox: Run tests under Python 3.13.