Python:按条件绘制多个正/负条形图

import matplotlib.pyplot as plt
import numpy as np

# 示例数据
categories = ['A', 'B', 'C', 'D']
values_positive = [3, 5, 7, 2]  # 正值数据
values_negative = [-1, -4, -6, -3]  # 负值数据

# 设置条形图的位置
bar_width = 0.35
index = np.arange(len(categories))

# 绘制正条形图
plt.bar(index, values_positive, bar_width, label='Positive', color='green')

# 绘制负条形图
plt.bar(index, values_negative, bar_width, label='Negative', color='red', bottom=values_positive)

# 添加图表元素
plt.xlabel('Categories')
plt.ylabel('Values')
plt.title('Positive and Negative Bar Charts by Condition')
plt.xticks(index, categories)
plt.legend()

# 显示图表
plt.show()