如何在matplotlib中绘制一个数据帧的多个值

import matplotlib.pyplot as plt
import pandas as pd

data = {'x': [1, 2, 3, 4, 5],
        'y1': [10, 15, 7, 12, 9],
        'y2': [8, 11, 6, 14, 5],
        'y3': [13, 9, 5, 10, 15]}
df = pd.DataFrame(data)

plt.plot(df['x'], df['y1'], label='y1')
plt.plot(df['x'], df['y2'], label='y2')
plt.plot(df['x'], df['y3'], label='y3')

plt.legend()
plt.title('Multiple Values in a DataFrame')
plt.xlabel('x')
plt.ylabel('y')

plt.show()