text: #!/usr/bin/env python3
  
  import matplotlib.pyplot as plt
  import numpy as np
  
  def main():
      x1, y1 = np.array([2,4,6,7]), np.array([4,3,5,1])
      x2, y2 = np.array([1,2,3,4]), np.array([4,2,3,1])
      # Same as: plt.plot(x1, y1, 'g', x2, y2, 'r')
      plt.plot(x1, y1, 'g')
      plt.plot(x2, y2, 'r')
      plt.xlabel('x')
      plt.ylabel('y')
      plt.title('part03-e09')
      plt.show()
  
  if __name__ == "__main__":
      main()
  