How does one insert statistical annotations (stars or p-values) into matplotlib / seaborn plots?

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Here how to add statistical annotation to a Seaborn box plot:

import seaborn as sns, matplotlib.pyplot as plt

tips = sns.load_dataset("tips")
sns.boxplot(x="day", y="total_bill", data=tips, palette="PRGn")

# statistical annotation
x1, x2 = 2, 3   # columns 'Sat' and 'Sun' (first column: 0, see plt.xticks())
y, h, col = tips['total_bill'].max() + 2, 2, 'k'
plt.plot([x1, x1, x2, x2], [y, y+h, y+h, y], lw=1.5, c=col)
plt.text((x1+x2)*.5, y+h, "ns", ha="center", va="bottom", color=col)

plt.show()

And here the result:
box plot annotated

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