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Autodetect some transform properties. #14922

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Merged
merged 1 commit into from
Aug 5, 2019
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anntzer
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@anntzer anntzer commented Jul 30, 2019

  • 1d transforms are always separable, no need to repeat is_separable = True again and again.
  • If a subclass overrides inverted() then it is most likely invertible
    (though not always), no need to repeat has_inverse = True again and
    again (but subclasses can always override to has_inverse = False).

PR Summary

PR Checklist

  • Has Pytest style unit tests
  • Code is Flake 8 compliant
  • New features are documented, with examples if plot related
  • Documentation is sphinx and numpydoc compliant
  • Added an entry to doc/users/next_whats_new/ if major new feature (follow instructions in README.rst there)
  • Documented in doc/api/api_changes.rst if API changed in a backward-incompatible way

@tacaswell tacaswell added this to the v3.2.0 milestone Aug 5, 2019
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How often do we check these in the code, iirc the the performance cost of properties over attribute access is sizable.

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This actually seems like a good case for __init_subclass__....

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anntzer commented Aug 5, 2019

Good point re __init_subclass__, now implemented, which should also handle any worries about performance cost.

- :attr:`is_separable`
- :attr:`has_inverse`
- :meth:`inverted` (if :attr:`has_inverse` is True)
- :attr:`is_separable` (defaults to True for 1d -> 1d transforms)
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Subclasses of this class should override the following members (at minimum):

Is not correct anymore for is_separable and has_inverse. Either rephrase or put those two in a separate block.

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good point, done

- 1d transforms are always separable, no need to repeat `is_separable =
  True` again and again.
- If a subclass overrides `inverted()` then it is most likely invertible
  (though not always), no need to repeat `has_inverse = True` again and
  again (but subclasses can always override to `has_inverse = False`).
@timhoffm timhoffm merged commit 3670867 into matplotlib:master Aug 5, 2019
@anntzer anntzer deleted the tprop branch August 5, 2019 16:07
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