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Add a neworientation parameter to Violinplot and deprecatevert#27998

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timhoffm merged 4 commits intomatplotlib:mainfromsaranti:orientation
May 14, 2024

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@saranti
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@sarantisaranti commentedApr 1, 2024•
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PR summary

Partiallycloses#13435. Replace thevert: bool parameter withorientation : {'vertical', 'horizontal'}.
Also changed the Violin plot basics gallery example to reflect the changes.

The other half of issue#13435 is to do the same to boxplots

PR checklist

Comment on lines 8301 to 8304
defviolinplot(self,dataset,positions=None,vert=None,
orientation='vertical',widths=0.5,showmeans=False,
showextrema=True,showmedians=False,
quantiles=None,points=100,bw_method=None,side='both'):
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orientation can't be inserted in the middle here to prevent breaking passing all arguments positionally. I believe that will be fixed by#27786.

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Since#27786 is now merged, should we putorientation in the place wherevert was?

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It would also be nice to make this a pending deprecation at first. Otherwise users of downstream libraries like seaborn (attn@mwaskom) will see our deprecation warning, but cannot do anything about it because it's in the seaborn code base. During the pending period, downstream libraries can already switch to the new API.

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Thoughtful but no need specifically for seaborn — seaborn's violinplots predate matplotlib's by several years :D

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Thanks for the feedback. I’ve only checked boxplot, which will get the same change (#13435).

@sarantisaranti marked this pull request as draftApril 3, 2024 09:06
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Oh actually boxplot is relevant to me. But I don’t think this is right:

It would also be nice to make this a pending deprecation at first. Otherwise users of downstream libraries like seaborn (attn@mwaskom) will see our deprecation warning

TheDeprecationWarning class is fine; by default it only shows up in tests or when raised in “main”. The issue is when libraries jump straight toFutureWarning, which is always visible.

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@sarantisaranti marked this pull request as ready for reviewApril 3, 2024 10:38
@sarantisaranti marked this pull request as draftApril 4, 2024 07:40
@sarantisaranti marked this pull request as ready for reviewApril 4, 2024 08:35
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saranti commentedApr 5, 2024•
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Edit: This block of code is going to be copied verbatim for the boxplots. Would it be better to turn it into a function and add it to _axes.py or cbook?
It's only needed during the deprecation period. Once it's over, the whole thing will be removed.

ifvertisnotNone:
_api.warn_deprecated(
"3.10",
name="vert: bool",
alternative="orientation: {'vertical', 'horizontal'}"
)
# vert and orientation parameters are linked until vert's
# deprecation period expires. If both are selected,
# vert takes precedence.
ifvertorvertisNoneandorientationisNone:
orientation='vertical'
elifvertisFalse:
orientation='horizontal'

@sarantisaranti marked this pull request as ready for reviewApril 17, 2024 11:37
Comment on lines 8609 to 8618
# vert and orientation parameters are linked until vert's
# deprecation period expires. If both are selected,
# vert takes precedence.
ifvertorvertisNoneandorientationisNone:
orientation='vertical'
elifvertisFalse:
orientation='horizontal'

iforientationisnotNone:
_api.check_in_list(['horizontal','vertical'],orientation=orientation)
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I'm not following the logic here completely. After whatever mangling vert and orientation, shouldn't we have a normalizedorientation that must be 'horizontal' or 'vertical'? In other words

  • Why do we allow orientation to be None in 8617 and would that even work for the following code?

Can't we simply

if vert is not None:    _api.warn_deprecated(...)    orientation = 'vertical' if vert else 'horizontal'_api.check_in_list(['horizontal', 'vertical'], orientation=orientation)

and defaultorientation='vertical' instead of defaulting it to None?

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Yes it should default to vertical instead of None (it even says so in the docstring) so there was no reason for it other than making it more convoluted. That code change is great, I'll add it to the next commit

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This seems much simpler than theboxplot one!

This block of code is going to be copied verbatim for the boxplots. Would it be better to turn it into a function and add it to _axes.py or cbook?
It's only needed during the deprecation period. Once it's over, the whole thing will be removed.

This is a good point. I think my inclination is to leave it duplicated in the two functions. It's pretty simple (more simple now than when you asked the question!) so I don't think the duplication does much harm.

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The positions of the violins; i.e. coordinates on the x-axis for
vertical violins (or y-axis for horizontal violins).
vert : bool, default: True.
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@rcomerrcomerMay 12, 2024•
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Suggested change
vert :bool,default:True.
vert :bool,optional

(optional is synonymous withdefault: None)

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@timhoffmtimhoffm added this to thev3.10.0 milestoneMay 14, 2024
@timhoffmtimhoffm merged commit6e8fcbb intomatplotlib:mainMay 14, 2024
@sarantisaranti deleted the orientation branchMay 15, 2024 07:26
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boxplot/violinplot orientation-setting API

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