python画直线

#!/usr/bin/env python

import matplotlib.pyplot as plt  
import numpy as np  
#beita = 1  
#gama = 0.5  
#x:from 0 to 8
x = np.linspace(0, 8, 10)  
y = 2*x
#xx = x*9.8*0.6  
#OH = (0.33/(1-0.33)+beita)*(14.12-0.73*4.68)+0.73*4.68  
#Oh = (0.33/(1-0.33)+gama)*(14.12-0.73*4.68)+0.73*4.68  
#Or = 0.946*xx+0.25272  
#Osita = 3*OH-Oh-xx*0.683552239-1.481  
#Oz = 12.639+0.66*(OH-Oh)+0.316447761*xx  
plt.figure(figsize=(8, 8))  
plt.plot(x, y, color="red")  
#plt.plot(x, Osita, color="blue")  
#plt.plot(x, Oz, color="green")  
#plt.xlabel(u'\u03c1'+" (g/cm^3)", fontproperties='SimHei', fontsize=18)  
#plt.ylabel(u'\u03c3'+" (Mpa)", fontproperties='SimHei', fontsize=18)  
plt.show()