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.venv/Lib/site-packages/pandas/_libs/indexing.pyx

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+cdef class NDFrameIndexerBase:
+    """
+    A base class for _NDFrameIndexer for fast instantiation and attribute access.
+    """
+    cdef public:
+        str name
+        object obj, _ndim
+
+    def __init__(self, name: str, obj):
+        self.obj = obj
+        self.name = name
+        self._ndim = None
+
+    @property
+    def ndim(self) -> int:
+        # Delay `ndim` instantiation until required as reading it
+        # from `obj` isn't entirely cheap.
+        ndim = self._ndim
+        if ndim is None:
+            ndim = self._ndim = self.obj.ndim
+            if ndim > 2:
+                raise ValueError(  # pragma: no cover
+                    "NDFrameIndexer does not support NDFrame objects with ndim > 2"
+                )
+        return ndim