new_contents: # -*- coding: utf-8 -*-
  """
  Spyder Editor
  
  This is a temporary script file.
  """
  
  import numpy as np
  import matplotlib.pyplot as plt
  
  x = np.linspace(0, 6, 500);
  y = np.sin(x)
  plt.style.use('ggplot')
  fig = plt.figure()
  plt.plot(x, y)
  plt.show()
  fig.savefig('sin.pdf', format='pdf')
subject: Add Numpy.