Matplotlib仅在堆叠条形图上绘制每2条条形图中的1条

import matplotlib.pyplot as plt

categories = ['Category 1', 'Category 2', 'Category 3', 'Category 4']
subcategories = ['Subcategory 1', 'Subcategory 2']
data = [[10, 20], [15, 25], [12, 18], [8, 16]]

width = 0.4  # 每个条形图的宽度
spacing = 0.2  # 两个条形图之间的间隔

fig, ax = plt.subplots()

for i, category in enumerate(categories):
    x = [j + (width + spacing) * i for j in range(len(subcategories))]
    y = data[i]
    ax.bar(x, y, width=width)

ax.set_xticks([j + (width + spacing) * (len(categories) - 1) / 2 for j in range(len(subcategories))])
ax.set_xticklabels(subcategories)
ax.legend(categories)

plt.show()