从 pandas 的matplotlib中的交叉表显示堆叠条形图中100％的百分比 [英] Display percent of 100 in stacked bar plot from crosstab from matplotlib in pandas

问题描述

我需要帮助在从数据框中的交叉表创建的 Pandas 中的堆积条形图的每个部分中添加总数(无小数)的百分比分布.

I need help adding the percent distribution of the total (no decimals) in each section of a stacked bar plot in pandas created from a crosstab in a dataframe.

这是示例数据:

data = {
    'Name':['Alisa','Bobby','Bobby','Alisa','Bobby','Alisa',
            'Alisa','Bobby','Bobby','Alisa','Bobby','Alisa'],
    'Exam':['Semester 1','Semester 1','Semester 1','Semester 1','Semester 1','Semester 1',
            'Semester 2','Semester 2','Semester 2','Semester 2','Semester 2','Semester 2'],

    'Subject':['Mathematics','Mathematics','English','English','Science','Science',
               'Mathematics','Mathematics','English','English','Science','Science'],
   'Result':['Pass','Pass','Fail','Pass','Fail','Pass','Pass','Fail','Fail','Pass','Pass','Fail']}
df = pd.DataFrame(data)
df

这是我的代码:

#crosstab
pal = ["royalblue", "dodgerblue", "lightskyblue", "lightblue"]
ax= pd.crosstab(df['Name'], df['Subject']).apply(lambda r: r/r.sum()*100, axis=1)
ax.plot.bar(figsize=(10,10),stacked=True, rot=0,colors=pal)
display(ax)

plt.legend(loc='top', bbox_to_anchor=(0.1, 1.0),title="Subject",)

plt.xlabel('Name')
plt.ylabel('Percent Distribution')

plt.show()

我知道我需要以某种方式添加 plt.text，但无法弄清楚.我希望将总数的百分比嵌入到堆叠条中.感谢您提前提出任何建议！

I know I need to add a plt.text some how, but can't see to figure it out. I would like the percent of the totals to be embedded within the stacked bars. Thanks for any advice in advance!

推荐答案

让我们尝试:

# crosstab
pal = ["royalblue", "dodgerblue", "lightskyblue", "lightblue"]
ax= pd.crosstab(df['Name'], df['Subject']).apply(lambda r: r/r.sum()*100, axis=1)
ax_1 = ax.plot.bar(figsize=(10,10),stacked=True, rot=0, colors=pal)
display(ax)

plt.legend(loc='upper center', bbox_to_anchor=(0.1, 1.0), title="Subject")

plt.xlabel('Name')
plt.ylabel('Percent Distribution')

for rec in ax_1.patches:
    height = rec.get_height()
    ax_1.text(rec.get_x() + rec.get_width() / 2, 
              rec.get_y() + height / 2,
              "{:.0f}%".format(height),
              ha='center', 
              va='bottom')

plt.show()

输出:

这篇关于从 pandas 的matplotlib中的交叉表显示堆叠条形图中100％的百分比的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！