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Handle inherited is_separable, has_inverse in transform props detection. #14991

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Aug 12, 2019
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Handle inherited is_separable, has_inverse in transform props detection. #14991

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8 changes: 5 additions & 3 deletions lib/matplotlib/transforms.py
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Original file line number Diff line number Diff line change
Expand Up @@ -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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