在matplotlib中，打印数据的分组条形图

import matplotlib.pyplot as plt

fig, ax = plt.subplots()

group_A = [10, 15, 12]
group_B = [8, 11, 9]

import numpy as np

bar_width = 0.35
index = np.arange(len(group_A))

ax.bar(index, group_A, bar_width, label='Group A')
ax.bar(index + bar_width, group_B, bar_width, label='Group B')

ax.set_xlabel('Groups')
ax.set_ylabel('Data')
ax.set_title('Grouped Bar Chart')
ax.set_xticks(index + bar_width / 2)
ax.set_xticklabels(('Data 1', 'Data 2', 'Data 3'))
ax.legend()

plt.show()