如何为matplotlib中的每个bar分配不同的标签？

import matplotlib.pyplot as plt
import numpy as np

fig, ax = plt.subplots()

labels = ['Label 1', 'Label 2', 'Label 3']

x = np.arange(len(labels))

ax.bar(x, [10, 20, 30], align='center')

ax.set_xticks(x)
ax.set_xticklabels(labels)

import matplotlib.pyplot as plt
import numpy as np

fig, ax = plt.subplots()

labels = ['Label 1', 'Label 2', 'Label 3']
x = np.arange(len(labels))

ax.bar(x, [10, 20, 30], align='center')
ax.set_xticks(x)
ax.set_xticklabels(labels)

plt.show()