python绘线（简单）

# coding=utf-8 from numpy import *import numpy as npimport pylab as pl#绘制线x = np.linspace(-100, 100)y1 = x**2+x+6y2 = 100*x+6 pl.figure(figsize=(7,5))#图形大小#$$的意思是将里边的公式规范为正常数学表达式pl.plot(x, y1,label="$y=x^2+x+6$", color="red", linewidth=1.0, linestyle='-')pl.plot(x, y2,label="$y=100x+6$", color="green", linewidth=1.0, linestyle='--')pl.title("Example")#标题pl.xlabel("X")#x轴标题pl.ylabel("Y")#y轴标题pl.ylim(-2000,10000)#y轴范围pl.xlim(-100, 100)#x轴范围pl.legend()#显示label标签pl.show()