如何将python matplotlib.pyplot图例标记更改为1、2、3之类的序列号，而不是形状或字符？

import matplotlib.pyplot as plt
import numpy as np

fig = plt.figure()

x = np.linspace(0, 10, 100)
y1 = np.sin(x)
y2 = np.cos(x)

plt.plot(x, y1, label='sin(x)')
plt.plot(x, y2, label='cos(x)')

handles, labels = plt.gca().get_legend_handles_labels()
labels = [str(i) for i in range(1, len(labels) + 1)]  # 使用序列号作为标记
plt.legend(handles, labels)

plt.show()

import matplotlib.pyplot as plt
import numpy as np

fig = plt.figure()

x = np.linspace(0, 10, 100)
y1 = np.sin(x)
y2 = np.cos(x)

plt.plot(x, y1, label='sin(x)')
plt.plot(x, y2, label='cos(x)')

handles, labels = plt.gca().get_legend_handles_labels()
labels = [str(i) for i in range(1, len(labels) + 1)]
plt.legend(handles, labels)

plt.show()