problem with plotting

[Anish Chapagain]

hi,
I'm getting problem with the code below which after displaying graph
plotted in external window, doesnot closes itself, even after closing
the window of plotting the main python window shows processing.
code goes like this...

plot(col1, col2, linewidth=1.0)
xlabel('col1')
ylabel('col2')
title('Values from List created with file read')
grid(True)
savefig('col1 col2.pdf')
show()


is there any other function to be called after show() to close it
properly.

thank's for any help.

anish