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Make zdir key-word only for 3D-scatter and -bar#27538

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@oscargusoscargus commentedDec 18, 2023
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PR summary

Related to#27287 and#27368. Putting it here to see the consequences on examples etc and to discuss if it makes sense. Will naturally add release notes.

(As far as I can see,zdir is not tested at all forscatter.bar only has a single test which passes zdir as a kwarg.)

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@oscargusoscargus changed the titleMake zdir key-word onlyMake zdir key-word only for 3D-scatter and -barDec 18, 2023
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It seems okay, other than the missing tests?

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It seems okay, other than the missing tests?

Missing tests as in tests to see that it actually warns or tests forzdir? The first will be there, the second I tried but couldn't really understand how it was supposed to work, so seems bad to add a test when one isn't convinced that it works as expected...

@@ -2653,7 +2653,7 @@ def scatter(self, xs, ys, zs=0, zdir='z', s=20, c=None, depthshade=True,
if np.may_share_memory(zs_orig, zs): # Avoid unnecessary copies.
zs = zs.copy()

patches = super().scatter(xs, ys, s=s, c=c, *args, **kwargs)
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Here and below atsuper.bar(), are we sure that the super class method can't use any*args? Don't want to break any plots that rely on it if so.

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In theory yes:https://matplotlib.org/devdocs/api/_as_gen/matplotlib.axes.Axes.scatter.html#matplotlib.axes.Axes.scatter

but very unlikely in practice. One would have to pass all 3D positional parameters

scatter(self, xs, ys, zs, zdir, s, c, depthshade, ...)

and then continue with the non-overlapping 2D positional parameters, minimally:

scatter(self, xs, ys, zs, zdir, s, c, depthshade, marker)

I would be very surprised if somebody took the effort to figure that out.

I'm inclined to allow tolerate minimal breakage here.

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Works for me!

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