Showing the plot window more than once

Question

import matplotlib
import pylab
x=[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
y=[2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
plotting=pylab.plot(x,y)
pylab.show(plotting)

Answer 1

Because when you close the window python tears down and deletes the figure. Calling show again does nothing because there is no figure to show.

Passing an arguement to show like you do here does nothing (doc). The only argument that show takes is a key-word argument of block.