如何在将鼠标悬停在熊猫数据框上时为标签添加批注

pip install pandas
pip install matplotlib

import pandas as pd
import matplotlib.pyplot as plt

data = {'姓名': ['张三', '李四', '王五', '赵六'],
        '年龄': [25, 30, 35, 40],
        '性别': ['男', '女', '男', '女']}
df = pd.DataFrame(data)

def on_hover(event):
    if event.inaxes == ax:
        for i, bar in enumerate(ax.containers[0]):
            if bar.contains(event)[0]:
                x = bar.get_x() + bar.get_width() / 2
                y = bar.get_height()
                text = f"{df['姓名'][i]}: {df['年龄'][i]}岁, {df['性别'][i]}"
                ax.annotate(text, (x, y), (x, y + 5), ha='center', color='black', fontsize=8, arrowprops=dict(arrowstyle='->'))

fig, ax = plt.subplots()
ax.bar(df['姓名'], df['年龄'])
fig.canvas.mpl_connect('motion_notify_event', on_hover)
plt.show()