python - 如何自定义条形注释以不显示选定值

Question

我有以下数据集:

data = [6.92, 1.78, 0.0, 0.0, 3.5, 8.82, 3.06, 0.0, 0.0, 5.54, -10.8, -6.03, 0.0, 0.0, -6.8, 13.69, 8.61, 9.98, 0.0, 9.42, 4.91, 3.54, 2.62, 5.65, 1.95, 8.91, 11.46, 5.31, 6.93, 6.42]

有没有办法从条形图中删除 0.0 标签？

我尝试了 df = df.replace(0, "") 但随后我得到了一个 list index out of range 错误代码。

我的代码:

import pandas as pd
import matplotlib.pyplot as plt
import numpy as np

data = [6.92, 1.78, 0.0, 0.0, 3.5, 8.82, 3.06, 0.0, 0.0, 5.54, -10.8, -6.03, 0.0, 0.0, -6.8, 13.69, 8.61, 9.98, 0.0, 9.42, 4.91, 3.54, 2.62, 5.65, 1.95, 8.91, 11.46, 5.31, 6.93, 6.42]

df = pd.DataFrame(np.array(data).reshape(6,5), columns=['Bank1', 'Bank2', 'Bank3', 'Bank4', 'Bank5'], index =['2016', '2017', '2018', '2019', '2020', '2021'])

print(df)
ax = df.plot(kind='bar', rot=0, xlabel='Year', ylabel='Total Return %', title='Overall Performance', figsize=(15, 10))

ax.bar_label(ax.containers[0], fmt='%.1f', fontsize=8, padding=3)
ax.bar_label(ax.containers[1], fmt='%.1f', fontsize=8, padding=3)
ax.bar_label(ax.containers[2], fmt='%.1f', fontsize=8, padding=3)
ax.bar_label(ax.containers[3], fmt='%.1f', fontsize=8, padding=3)
ax.bar_label(ax.containers[4], fmt='%.1f', fontsize=8, padding=3)

ax.legend(title='Columns', bbox_to_anchor=(1, 1.02), loc='upper left')
plt.show()

Answer 1

• labels 传递给 matplotlib.pyplot.bar_label必须定制
  • 根据需要调整比较 (!= 0) 值或范围。
• labels = [f'{v.get_height():0.0f}' if v.get_height() != 0 else '' for v in c ] 没有赋值表达式(:=).
• 查看此 answer使用 .bar_label
获取更多详细信息和示例
• 在 pandas 1.3.4、python 3.8.12^1. 和 matplotlib 3.4.3< 中测试^1.
  1. 要求的最低版本分别为 3.8 和 3.4.2

import pandas as pd
import matplotlib.pyplot as plt

data = [6.92, 1.78, 0.0, 0.0, 3.5, 8.82, 3.06, 0.0, 0.0, 5.54, -10.8, -6.03, 0.0, 0.0, -6.8, 13.69, 8.61, 9.98, 0.0, 9.42, 4.91, 3.54, 2.62, 5.65, 1.95, 8.91, 11.46, 5.31, 6.93, 6.42]

df = pd.DataFrame(np.array(data).reshape(6,5), columns=['Bank1', 'Bank2', 'Bank3', 'Bank4', 'Bank5'], index =['2016', '2017', '2018', '2019', '2020', '2021'])

ax = df.plot(kind='bar', rot=0, xlabel='Year', ylabel='Total Return %', title='Overall Performance', figsize=(15, 10))

for c in ax.containers:
    
    # customize the label to account for cases when there might not be a bar section
    labels = [f'{h:0.1f}' if (h := v.get_height()) != 0 else '' for v in c ]
    
    # set the bar label
    ax.bar_label(c, labels=labels, fontsize=8, padding=3)

ax.legend(title='Columns', bbox_to_anchor=(1, 1.02), loc='upper left')
plt.show()