I am done

rl/Lib/site-packages/matplotlib/axes/__init__.py

@@ -0,0 +1,18 @@
+from . import _base
+from ._axes import Axes  # noqa: F401
+
+# Backcompat.
+Subplot = Axes
+
+
+class _SubplotBaseMeta(type):
+    def __instancecheck__(self, obj):
+        return (isinstance(obj, _base._AxesBase)
+                and obj.get_subplotspec() is not None)
+
+
+class SubplotBase(metaclass=_SubplotBaseMeta):
+    pass
+
+
+def subplot_class_factory(cls): return cls