Fix PandasObject cache attribute name

Author: fjetter

pandas/core/base.py

@@ -80,8 +80,9 @@ class PandasObject(DirNamesMixin):
     Baseclass for various pandas objects.
     """
 
-    # results from calls to methods decorated with cache_readonly get added to _cache
-    _cache: Dict[str, Any]
+    # results from calls to methods decorated with
+    # cache_readonly get added to _cache_property
+    _cache_property: Dict[str, Any]
 
     @property
     def _constructor(self):
@@ -101,12 +102,12 @@ def _reset_cache(self, key: Optional[str] = None) -> None:
         """
         Reset cached properties. If ``key`` is passed, only clears that key.
         """
-        if not hasattr(self, "_cache"):
+        if not hasattr(self, "_cache_property"):
             return
         if key is None:
-            self._cache.clear()
+            self._cache_property.clear()
         else:
-            self._cache.pop(key, None)
+            self._cache_property.pop(key, None)
 
     def __sizeof__(self) -> int:
         """