python data visualization pie chart drawing

This article brings you relevant knowledge about python, which mainly organizes issues related to the drawing of pie charts. Pyplot contains a series of related functions of drawing functions, among which the pie() function You can draw a pie chart. Let’s take a look at it. I hope it will be helpful to everyone.

Recommended learning: python

Pyplot is a sublibrary of Matplotlib, providing a drawing API similar to MATLAB.
Pyplot contains a series of related drawing functions, among which the pie() function can draw pie charts.
When used, we can use import to import the pyplot library and set an alias plt.
Also used the numpy mathematical function library

1. We first draw a simple pie chart

import matplotlib.pyplot as pltimport numpy as np

x = np.array([10, 20, 30, 40])#用一维数组存入各个饼块的尺寸。plt.pie(x)#绘制饼状图，默认是从x轴正方向逆时针开始绘图plt.show()#显示饼状图

Among them, the parameters in the pie() function:
x: the size of each pie piece. A 1-dimensional array-like structure.

2. Then we add a label to each piece of the pie chart, add a title to the pie chart, and count the proportion of people using each operating system.

import matplotlib.pyplot as pltimport numpy as np
plt.rcParams['font.sans-serif'] = ['Microsoft YaHei']
 #指定字体为雅黑，解决文字乱码问题x = np.array([30, 24, 16, 30])plt.pie(x,
        labels=['Windows', 'Linux', 'ios', 'Android'],  
        # 设置饼图标签，以列表形式传入
        )plt.title("各操作系统使用占比")plt.show()

The parameters in the pie() function:
x: the size of each pie piece. A 1-dimensional array-like structure.
label: The label of each pie piece. is a list of strings. The default value is None.
The plt.title() function is used to set the image title.
Note: Using plt.title() directly will display English by default.

3. Finally, clearly display the proportion of each operating system, change the color of each pie piece, and highlight the ios module

import matplotlib.pyplot as pltimport numpy as np

y = np.array([30, 24, 16, 30])plt.rcParams['font.sans-serif'] = ['Microsoft YaHei'] #指定字体为雅黑，解决文字乱码问题plt.pie(y,
        labels=['Windows', 'Linux', 'ios', 'Android'],  # 设置饼图标签
        autopct="(%1.1f%%)" #饼块内标签。
        colors=("r", "blue", "#88c999", (1, 1, 0))，        #设置各饼块的颜色，r表示red，blue代表蓝色
        #88c998十六进制表示绿色 （1,1,0）以元组形式表示黄色
        explode=[0, 0, 0.1, 0] #
        )plt.title("操作系统使用占比")plt.show()

Among them Parameters in the pie() function:

• autopct: label within the pie block, format the label within the pie block, and display the percentage value in string format. autopct="%1.1f%%" indicates that floating point numbers are displayed, with one integer occupancy and one decimal point occupancy.
  
• colors: Set the color of each section

• -[Note]: The color list can be composed of the following:
  Represents the color English words: such as red "red"
  The abbreviation of color words such as: red "r", yellow "y"
  RGB format: Hexadecimal format such as "#88c999";(r,g,b ) Tuple format

• explode: The offset distance of each pie piece relative to the radius of the pie circle, the value is a decimal. The form is a 1-dimensional array-like structure. The larger the value, the farther the offset distance.

Recommended learning: python

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