使用带水平线的pandas绘制矩形面片

要将矩形添加到轴上,需要使用 matplotlib.patches.Rectangle ,然后使用 axes.add_patch

import matplotlib.pyplot as plt
import matplotlib.patches as patches
import pandas as pd    

tips = pd.DataFrame([20, 10, 50, 60, 90, 20, 30, 15, 75, 35], columns = ['Tips'])
tips.index += 1
tips.index.name = 'Meals'
next_tip = tips.mean()
tips['Tips'] = tips['Tips'].astype(float) 
tips['Residuals'] = tips['Tips'] - float(next_tip)

plot = tips.reset_index().plot.scatter(x=tips.index.name, y='Tips', label='Tip Amount', s=60, figsize=(15,5))
plot.axhline(next_tip[0], linestyle='dashdot', color='orange', linewidth=3, label='Best fit')
plot.annotate('  -20.5', xy=(1, 40.5), xytext=(1, 20), arrowprops=dict(facecolor='black', width=0.1, headwidth=6))
plot.annotate('   19.5', xy=(4, 40.5), xytext=(4, 60), arrowprops=dict(facecolor='black', width=0.1, headwidth=6))
plot.annotate('   -9.5', xy=(7, 40.5), xytext=(7, 30), arrowprops=dict(facecolor='black', width=0.1, headwidth=6))

# create the rectangle
rect = patches.Rectangle(xy=(1, 20), width=20, height=20, fill=False)
# add it to the axes
plot.add_patch(rect)

plt.show()