如何使用现有数据框以图形方式创建分组条形图

import matplotlib.pyplot as plt
import pandas as pd

data = {'group1': ['A', 'A', 'B', 'B', 'C', 'C'],
        'group2': ['X', 'Y', 'X', 'Y', 'X', 'Y'],
        'value': [10, 15, 8, 12, 9, 11]}
df = pd.DataFrame(data)

grouped_df = df.groupby(['group1', 'group2']).mean().reset_index()

fig, ax = plt.subplots()
x = range(len(grouped_df))
width = 0.35

ax.bar(x, grouped_df['value'], width, label='Value')
ax.set_xticks(x)
ax.set_xticklabels(grouped_df['group1'] + '-' + grouped_df['group2'])
ax.legend()

plt.show()