text: import numpy as np 
  import matplotlib.pyplot as plt 
  x=np.array([1,2,3,4,5]) 
  y=np.array([12,45,4,22,30]) 
  plt.plot(x,y,'g--')#https://matplotlib.org/2.1.2/api/_as_gen/matplotlib.pyplot.plot.html
  plt.plot(x,y,'o') 