Violin inner annotations

inner overlays a summary of the raw data inside each violin: "box" for an IQR bar with 1.5-IQR whiskers and a median dot, "quartile" for lines across the density at Q1/median/Q3, or "stick" for one line per observation.

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import numpy as np
import plotpress

rng = np.random.default_rng(7)
groups = [
    rng.normal(5.0, 0.35, 300),
    rng.normal(5.9, 0.52, 300),
    rng.normal(6.6, 0.64, 300),
]
names = ["setosa", "versicolor", "virginica"]

fig, axes = plotpress.subplots(1, 3, figsize=(12.0, 4.0), sharey=True)
for ax, inner in zip(axes, ["box", "quartile", "stick"]):
    ax.violinplot(groups, cut=2.0, inner=inner)
    ax.set_xticks([1, 2, 3])
    ax.set_xticklabels(names)
    ax.set_title(f'inner="{inner}"')
axes[0].set_ylabel("sepal length (cm)")
fig.tight_layout()