关于使用 matplotlib 将条形标签添加到分组条形图的问题

Question

我正在使用 matplotlib 绘制分组条形图。我想在每个栏的顶部添加 labelsz 和 labelsJ。这是我的代码：

import matplotlib.pyplot as plt
import numpy as np
labels = ['X1', 'X2', 'X3']
betaz = [0.5, 0.6, 0.4]
labelsz = ['***','***','**']

betaJ = [-0.8, -0.9, -0.2]
labelsJ = ['***','***','***']

x = np.arange(len(labels))
width = 0.35 

fig, ax = plt.subplots()
rects1 = ax.bar(x - width/2, betaz, width, label=r'$\beta_z$', color='navy')
rects2 = ax.bar(x + width/2, betaJ, width, label=r'$\beta_{JOE}$', color='gray')

# Add some text for labels, title and custom x-axis tick labels, etc.
ax.set_xticks(x)
ax.set_xticklabels(labels)
ax.legend()

plt.xticks(rotation=90)

fig.tight_layout()

plt.show()

我尝试使用 ax.bar_label(labelsz) 和 ax.bar_label(labelsJ) 但我不断收到 AttributeError: 'list' object has no attribute 'patches'。我对 matplotlib 很陌生，任何帮助都将不胜感激。

Answer 1

fig, ax = plt.subplots()
rects1 = ax.bar(x - width/2, betaz, width, label=r'$\beta_z$', color='navy')
rects2 = ax.bar(x + width/2, betaJ, width, label=r'$\beta_{JOE}$', color='gray')
ax.bar_label(rects1, labelsz,label_type='edge')
ax.bar_label(rects2, labelsJ,label_type='edge')

ax.bar_label 是这样写的