如何在matplotlib中显示每个条形顶部的Y坐标值

import matplotlib.pyplot as plt
import numpy as np

x = np.array([1, 2, 3, 4, 5])
y = np.array([10, 20, 15, 25, 30])

plt.bar(x, y)

for i, j in zip(x, y):
    plt.text(i, j, str(j), ha='center', va='bottom')

plt.show()

import matplotlib.pyplot as plt
import numpy as np

x = np.array([1, 2, 3, 4, 5])
y = np.array([10, 20, 15, 25, 30])

plt.bar(x, y)

for i, j in zip(x, y):
    plt.text(i, j, str(j), ha='center', va='bottom')

plt.show()