def show():
for manager in Gcf.get_all_fig_managers():<EOL><INDENT>pass<EOL><DEDENT>
For image backends - is not required
For GUI backends - show() is usually the last line of a pylab script and
tells the backend that it is time to draw.  In interactive mode, this may
be a do nothing func.  See the GTK backend for an example of how to handle
interactive versus batch mode