diff --git a/lib/matplotlib/transforms.py b/lib/matplotlib/transforms.py
index 112b867abb22..51182616b8a0 100644
--- a/lib/matplotlib/transforms.py
+++ b/lib/matplotlib/transforms.py
@@ -1227,14 +1227,16 @@ class Transform(TransformNode):
def __init_subclass__(cls):
# 1d transforms are always separable; we assume higher-dimensional ones
- # are not but subclasses can also directly set is_separable.
- if ("is_separable" not in vars(cls) # Was it overridden explicitly?
+ # are not but subclasses can also directly set is_separable -- this is
+ # verified by checking whether "is_separable" appears more than once in
+ # the class's MRO (it appears once in Transform).
+ if (sum("is_separable" in vars(parent) for parent in cls.__mro__) == 1
and cls.input_dims == cls.output_dims == 1):
cls.is_separable = True
# Transform.inverted raises NotImplementedError; we assume that if this
# is overridden then the transform is invertible but subclass can also
# directly set has_inverse.
- if ("has_inverse" not in vars(cls) # Was it overridden explicitly?
+ if (sum("has_inverse" in vars(parent) for parent in cls.__mro__) == 1
and hasattr(cls, "inverted")
and cls.inverted is not Transform.inverted):
cls.has_inverse = True
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