The following trivial program is supposed to generate one plot per key press
until the user presses 'q'.  Instead, nothing is displayed until the user
presses 'q'.  Any suggestions will be appreciated.

from os import sys
from matplotlib import *
from numpy.random import rand

while True:

   z= rand(20,20)
   fig= pyplot.figure(figsize=(8,8), dpi=120)
   pyplot.imshow(z)
   pyplot.show()

   chr= sys.stdin.read(1)
   if chr=='q': sys.exit(0)
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