python 运用numpy库与matplotlib库绘制数据图

import numpy as np
import matplotlib.pyplot as plt
x=np.linspace(0,6,100)
y=np.cos(2*np.pi*x)*np.exp(-x)+0.8
plt.plot(x,y,'k',color='r',linewidth=3,linestyle="-")
plt.show()

import numpy as np 
import matplotlib.pyplot as plt 
x = np.arange(0,  3  * np.pi,  0.1) 
y = np.sin(x)
plt.title("sine wave form")  
plt.plot(x, y) 
plt.show()