how to get the screen size for an application

[krishnakant Mane]

hello I am new to this list.
I am Krishnakant Mane from India.
I have just started to use wxpython and find it really great.
Please help me find one answer.
when I create a wx.frame, I will like to know what is the screen size
of the screen on which the frame is going to appear.  I was trying to
find out a way to center the frame on the screen and expect that it
should center itself on a 15 inch, 17 inch screen and so on.
can some one tell me how I can achieve this?
Krishnakant.