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Rejecting parameter 'positions' for boxplot(), refs #3566 #3576

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4 changes: 4 additions & 0 deletions seaborn/categorical.py
Original file line number Diff line number Diff line change
Expand Up @@ -1577,6 +1577,10 @@ def boxplot(
fliersize=None, hue_norm=None, native_scale=False, log_scale=None, formatter=None,
legend="auto", ax=None, **kwargs
):

if "positions" in kwargs:
msg = "boxplot() does not support parameter 'positions'. Consider to use native_scale=True and specify positions via parameter 'x'."
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Suggested change
msg = "boxplot() does not support parameter 'positions'. Consider to use native_scale=True and specify positions via parameter 'x'."
msg = "boxplot does not support parameter `positions`. Consider using `native_scale=True`.

Nit: For a horizontal boxplot you'd specify the positions with y so let's make the suggestion less specific. Note that I've also tweaked the formatting.

raise ValueError(msg)
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Small thing but TypeError is probably a better error class here, that is what you get if you passed an undefined parameter. Alternatively, RuntimeError since positions is technically valid but produces incorrect behavior.


p = _CategoricalPlotter(
data=data,
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20 changes: 19 additions & 1 deletion tests/test_categorical.py
Original file line number Diff line number Diff line change
Expand Up @@ -1168,7 +1168,25 @@
g = catplot(**kwargs, kind="box")

assert_plots_equal(ax, g.ax)



@pytest.mark.parametrize("positions", [None, [1, 2, 3, 4]])
def test_reject_boxpositions(self, positions):

kwargs = {
"x":[1, 2, 3, 4],
"y":[1, 1, 2, 2]
}

try:
boxplot(**kwargs, positions=positions)
err = None

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except ValueError as e:
err = e

assert(err is not None)
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It would be slightly more idiomatic I think to use pytest.raises here, ideally with the match parameter to make sure we're getting the error we expect.




class TestBoxenPlot(SharedAxesLevelTests, SharedPatchArtistTests):

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