BUG: __getattr__ must raise AttributeError if name not found (again)

lpsinger · lpsinger · commit a228b1f36846 · 2021-08-18T11:06:03.000-04:00
PR #20806 added another instance of a module-level `__getattr__` function that was missing a final `raise AttributeError` to catch unknown attributes. This is the same kind of bug as #20822. See also astropy/astropy#12038.
diff --git a/lib/matplotlib/cm.py b/lib/matplotlib/cm.py
@@ -34,6 +34,7 @@ def __getattr__(name):
         _api.warn_deprecated("3.5", name=name,
                              alternative="rcParams['image.lut']")
         return _LUTSIZE
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
 
 
 _LUTSIZE = mpl.rcParams['image.lut']
