new_contents: import numpy as np
  import matplotlib.pyplot as plt
  def mandelbrot( h,w, maxit=20 ):
       """Returns an image of the Mandelbrot fractal of size (h,w)."""
       y,x = np.ogrid[ -1.4:1.4:h*1j, -2:0.8:w*1j ]
       c = x+y*1j
       z = c
       divtime = maxit + np.zeros(z.shape, dtype=int)
  
       for i in range(maxit):
           z = z**2 + c
           diverge = z*np.conj(z) > 2**2            # who is diverging
           div_now = diverge & (divtime==maxit)  # who is diverging now
           divtime[div_now] = i                  # note when
           z[diverge] = 2                        # avoid diverging too much
  
       return divtime
  plt.imshow(mandelbrot(400,400))
  plt.show()
subject: add a mandelbrot set example, made by matplotlib