How to get the resolution of a monitor in Pygame?

You can use pygame.display.Info():

The docs say:

current_h, current_w: Height and width of the current video mode, or of the desktop mode if called before the display.set_mode is called.
(current_h, current_w are available since SDL 1.2.10, and pygame 1.8.0) They are -1 on error, or if an old SDL is being used.1.8.0)

pygame.display.Info() creates an Info Object with the attributes current_h and current_w. Create the Info Object before you call display.set_mode and then call display.set_mode with current_h and current_w from the object.

Example:

infoObject = pygame.display.Info()
pygame.display.set_mode((infoObject.current_w, infoObject.current_h))

I don't know if this will work, but if you just want a fullscreen window use the following:

pygame.display.set_mode((0,0),pygame.FULLSCREEN)

(of course you still have to import pygame).

I don't know much about pygame, but here is a way using the module win32api:

from win32api import GetSystemMetrics

width = GetSystemMetrics(0)
height = GetSystemMetrics(1)

Update: After taking a glance at the docs, seems like you can get it from pygame.display.Info, like this:

width, height = pygame.display.Info().current_w, pygame.display.Info().current_h

Hope this helps!