[英]How to plot a horizontal stacked bar with annotations
I used the example for Discrete distribution as horizontal bar chart example on matplotlib Discrete distribution as horizontal bar chart to create a chart showing share of the vote in Shropshire elections 2017.我在 matplotlib 上将离散分布示例用作水平条形图示例 将离散分布用作水平条形图来创建一个图表,显示 2017 年什罗普郡选举中的投票份额。
However, because I did not know how to manipulate the data I had to manually enter my data in the program which is clearly down to my own ignorance.然而,由于我不知道如何操作数据,我不得不在程序中手动输入我的数据,这显然是我自己的无知造成的。
I have the relevant data in a CSV file and can therefore load it as a dataframe.我在 CSV 文件中有相关数据,因此可以将其加载为 dataframe。
I wanted advice as to how to change the form of the data so it resembles the input for this chart.我想要关于如何更改数据形式的建议,使其类似于此图表的输入。
I am not sure what it is but seems possibly a dictionary type with key and value:我不确定它是什么,但似乎可能是带有键和值的字典类型:
import pandas as pd
import matplotlib.pyplot as plt
category_names = ['Labour', 'LD', 'Indep', 'Green', 'Tory']
results = {'Abbey': [16, 56, 4,0, 24],
'Albrighton': [0, 0, 32, 0, 68],
'Alveley & Claverley': [0, 25, 0, 0, 75],
'Bagley': [30, 30, 0, 0, 40],
'Battlefield': [34, 0, 0, 9, 57],
'Bayston Hill, Column & Sutton': [53, 4, 3, 7, 33],
'Belle Vue': [43,28,0,5,24]}
# setup dataframe using the dict provided in the OP
df = pd.DataFrame(results, index=category_names)
# display(df)
Abbey Albrighton Alveley & Claverley Bagley Battlefield Bayston Hill, Column & Sutton Belle Vue
Labour 16 0 0 30 34 53 43
LD 56 0 25 30 0 4 28
Indep 4 32 0 0 0 3 0
Green 0 0 0 0 9 7 5
Tory 24 68 75 40 57 33 24
I am trying to get the data to be formatted like this directly from the csv file when entered as a pandas dataframe.当输入为 pandas dataframe 时,我试图直接从 csv 文件中获取要像这样格式化的数据。
Have tried the values method and the to_dict
method and while they get data looking similar they are not quite correct.尝试了 values 方法和
to_dict
方法,虽然他们得到的数据看起来很相似,但它们并不完全正确。
df
from the OP.df
。pandas.DataFrame.plot
with the parameter stacked=True
pandas.DataFrame.plot
参数, stacked=True
'Party'
as the y-axis'Party'
作为 y 轴matplotlib
from version 3.4.2matplotlib
matplotlib.pyplot.bar_label
matplotlib.pyplot.bar_label
pandas 1.3.2
, python 3.8
1. , and matplotlib 3.4.2
1.pandas 1.3.2
、 python 3.8
1.和matplotlib 3.4.2
1. 中测试。
labels = [f'{v.get_width():.0f}' if v.get_width() > 0 else '' for v in c ]
without using the assignment expression ( :=
) labels = [f'{v.get_width():.0f}' if v.get_width() > 0 else '' for v in c ]
不使用赋值表达式 ( :=
).get_height()
for vertical bars..get_height()
用于垂直条。ax = df.plot.barh(stacked=True, cmap='tab10', figsize=(16, 10))
for c in ax.containers:
# format the number of decimal places and replace 0 with an empty string
labels = [f'{w:.0f}' if (w := v.get_width()) > 0 else '' for v in c ]
ax.bar_label(c, labels=labels, label_type='center')
matplotlib
before version 3.4.2matplotlib
.patch
components in a loop, and then only plot annotations for values greater than 0..patch
组件,然后仅对大于 0 的值进行 plot 注释。# plot
ax = df.plot.barh(stacked=True, cmap='tab10', figsize=(16, 10))
# annotations:
for p in ax.patches:
left, bottom, width, height = p.get_bbox().bounds
if width > 0:
ax.annotate(f'{width:0.0f}', xy=(left+width/2, bottom+height/2), ha='center', va='center')
'Ward'
as the y-axis'Ward'
作为 y 轴pandas.DataFrame.T
to swap the Index
and Columns
pandas.DataFrame.T
交换Index
和Columns
'Ward'
will now be the index and 'Party'
will be the columns 'Ward'
现在将是索引, 'Party'
将是列# transpose df from the OP so Party is the in the columns and Ward is the index
dft = df.T
# display(dft)
Labour LD Indep Green Tory
Abbey 16 56 4 0 24
Albrighton 0 0 32 0 68
Alveley & Claverley 0 25 0 0 75
Bagley 30 30 0 0 40
Battlefield 34 0 0 9 57
Bayston Hill, Column & Sutton 53 4 3 7 33
Belle Vue 43 28 0 5 24
matplotlib
from version 3.4.2matplotlib
# plot
ax = df.T.plot.barh(stacked=True, figsize=(16, 10))
plt.legend(loc='center left', bbox_to_anchor=(1.0, 0.5))
# annotations:
for c in ax.containers:
# format the number of decimal places and replace 0 with an empty string
labels = [f'{w:.0f}' if (w := v.get_width()) > 0 else '' for v in c ]
ax.bar_label(c, labels=labels, label_type='center')
matplotlib
before version 3.4.2matplotlib
# plot
ax = dft.plot.barh(stacked=True, figsize=(16, 10))
plt.legend(loc='center left', bbox_to_anchor=(1.0, 0.5))
# annotations:
for p in ax.patches:
left, bottom, width, height = p.get_bbox().bounds
if width > 0:
ax.annotate(f'{width:0.0f}', xy=(left+width/2, bottom+height/2), ha='center', va='center')
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