matplotlib学习2-常见图形-折线图

import matplotlib
import matplotlib.pyplot as plt  #导入pyplot模块
import numpy as np
 
# Data for plotting
t = np.arange(0.0, 2.0, 0.01)#numpy构建一个数组，0到2之间，步长为0.01
s = 1 + np.sin(2 * np.pi * t)#numpy计算
 
fig, ax = plt.subplots()#subplots设置画布
ax.plot(t, s)
 
ax.set(xlabel='time (s)', ylabel='voltage (mV)',
       title='About as simple as it gets, folks')#设置图标题，x及y轴名称
ax.grid()#设置网格，默认有网格，可以按照如下设置线性，颜色及宽度
#ax.grid(True, linestyle = "-.", color = "r", linewidth = "1") 
fig.savefig("test.png")#保存图像
plt.show()