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This article is a detailed introduction to "Python how to realize pie chart and coordinate system". The content is detailed, the steps are clear, and the details are properly handled. I hope this article "Python how to realize pie chart and coordinate system" can help you solve your doubts. Let's go deeper and learn new knowledge together with the ideas of Xiaobian.

Python visualization

#Import two libraries

import numpy as np

import matplotlib.pyplot as plt

#The first parameter is the initial value of the x axis

#The second argument is the end value of the x axis

#The third returns num uniformly distributed samples, that is, how many points are taken from the interval 0-12, if the best value for the curve is a little larger

x = np.linspace(0, 12, 50)

y = np.sin(x) #function

z = np.cos(x) #function

plt.figure(figsize=(8, 4))#explained below

plt.plot(x, y, label="$sin(x)$", color="red", linewidth=2) #Plot function images and annotations

plt.plot(x, z, "b--", label="$cos(X^2)$")# b--means dashed line

plt.xlabel("Time(s)") #name of x-axis

plt.ylabel("Volt1")

plt.title("PyPlot First Example")

#The first argument is the starting value representing the y-axis

#The second argument is the end value representing the y-axis

plt.ylim(-1.2, 1, 2)

plt.legend()

plt.show () Here I want to add a knowledge

figure syntax description

figure(num=None, figsize=None, dpi=None, facecolor=None, edgecolor=None, frameon=True)

num: Image number or name, number is number, string is name

figsize: Specifies the width and height of the figure in inches;

The dpi parameter specifies the resolution of the drawing object, that is, how many pixels per inch. The default value is 80. 1 inch equals 2.5 cm. A4 paper is 21*30cm paper.

facecolor: background color

edgecolor: border color

frameon: whether to display a frame

The final rendering:

What's written above is a coordinate system.

Now let's see how the fan is drawn.

import numpy as np

import matplotlib.pyplot as plt

labels = 'A', 'B', 'C', 'D'

fracs = [15, 30.55, 44.44, 10]

explode = [0, 0, 0, 0] # 0.1 Bulge this part,

plt.axes(aspect=1) # set this , Figure is round, otherwise it is an ellipse

# autopct ，show percet

plt.pie(x=fracs, labels=labels, explode=explode, autopct='%3.1f %%',shadow=True, labeldistance=1.1, startangle=90,pctdistance=0.6)

plt.show()

labeldistance: how far the text is from the distant point, 1.1 refers to the position of 1.1 times the radius

autopct: text format inside a circle,%3.1f%% indicates a floating point number with three decimal places and one integer place

Shadow: Does the pie have a shadow?

startangle: Starting angle, 0, means turning counterclockwise from 0, which is the first block. It's usually better to start at 90 degrees.

pctdistance: percentage of text distance from center

patches, l_texts, p_texts: To get the return value of the pie chart,

p_texts: text inside the pie chart

l_texts: text outside the pie chart label

Let's see the renderings.

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