如何使用matplotlib绘制条形图中的前n个最高值？

import matplotlib.pyplot as plt
import numpy as np

data = {'A': 10, 'B': 15, 'C': 7, 'D': 12, 'E': 9, 'F': 20, 'G': 5}

sorted_data = sorted(data.items(), key=lambda x: x[1], reverse=True)
top_n = dict(sorted_data[:n])

fig, ax = plt.subplots()
names = list(top_n.keys())
values = list(top_n.values())
ax.bar(names, values)

ax.set_title('Top {} Highest Values'.format(n))
ax.set_xlabel('Categories')
ax.set_ylabel('Values')

plt.show()