如何使用matplotlib显示错误条形图提示处的水平线？

import matplotlib.pyplot as plt
import numpy as np

x = np.array([1, 2, 3, 4, 5])
y = np.array([2, 4, 6, 8, 10])
error = np.array([0.5, 1, 0.8, 0.3, 0.2])

plt.bar(x, y, yerr=error, capsize=4)

plt.axhline(y.mean(), color='red', linestyle='--', label='Mean')

plt.title('Bar Chart with Error Bars')
plt.xlabel('X-axis')
plt.ylabel('Y-axis')
plt.legend()

plt.show()

import matplotlib.pyplot as plt
import numpy as np

x = np.array([1, 2, 3, 4, 5])
y = np.array([2, 4, 6, 8, 10])
error = np.array([0.5, 1, 0.8, 0.3, 0.2])

plt.bar(x, y, yerr=error, capsize=4)
plt.axhline(y.mean(), color='red', linestyle='--', label='Mean')

plt.title('Bar Chart with Error Bars')
plt.xlabel('X-axis')
plt.ylabel('Y-axis')
plt.legend()

plt.show()