Python Paint   

http://www.bioinfo.org.cn/~casp/temp/spring.lecture/Matplotlib_slides.pdf

https://stackoverflow.com/questions/9215658/plot-a-circle-with-pyplot

install lib

pip install numpy
pip install matplotlib

examples

01 import numpy as np
02 import matplotlib.pyplot as plt
03 
04 a = [2,2]
05 b = [3,1]
06 
07 c = [1,3]
08 d = [2,2]
09 
10 e = [2,1]
11 f = [1,0]
12 
13 g = [2,3]
14 h = [1,0]
15 
16 
17 ax = plt.gca()
18 ax.cla()
19 ax.set_xlim(0,10)
20 ax.set_ylim(0,10)
21 
22 circle1=plt.Circle((2,3.5),0.5,color='g')
23 ax.add_artist(circle1)
24 
25 line2 = plt.plot(a, b, color='r')
26 line3 = plt.plot(c, d)
27 line4 = plt.plot(e, f)
28 line5 = plt.plot(g, h)
29 
30 plt.title("plot")
31 plt.show()