使用matplotlib和subplot绘制多个柱状图

import matplotlib.pyplot as plt

categories = ['Category 1', 'Category 2', 'Category 3']
values1 = [10, 15, 12]
values2 = [8, 11, 9]
values3 = [5, 9, 7]

fig, ax = plt.subplots()

bar_width = 0.2
index = range(len(categories))

rects1 = ax.bar(index, values1, bar_width, label='Value 1')
rects2 = ax.bar([i + bar_width for i in index], values2, bar_width, label='Value 2')
rects3 = ax.bar([i + 2 * bar_width for i in index], values3, bar_width, label='Value 3')

ax.set_xlabel('Categories')
ax.set_ylabel('Values')
ax.set_title('Multiple Bar Charts')
ax.set_xticks([i + bar_width for i in index])
ax.set_xticklabels(categories)
ax.legend()

plt.show()