''' pg_draw_circle_save101.py
draw a blue solid circle on a white background
save the drawing to an image file
for result see http://prntscr.com/156wxi
tested with Python 2.7 and PyGame 1.9.2 by vegaseat  16may2013
'''

import pygame as pg
pygame uses (r, g, b) color tuples
white = (255, 255, 255)
blue = (0, 0, 255)
width = 300
height = 300
create the display window
win = pg.display.set_mode((width, height))
optional title bar caption
pg.display.set_caption("Pygame draw circle and save")
default background is black, so make it white
win.fill(white)
draw a blue circle
center coordinates (x, y)
center = (width//2, height//2)
radius = min(center)
width of 0 (default) fills the circle
otherwise it is thickness of outline
width = 0
draw.circle(Surface, color, pos, radius, width)
pg.draw.circle(win, blue, center, radius, width)
now save the drawing
can save as .bmp .tga .png or .jpg
fname = "circle_blue.png"
pg.image.save(win, fname)
print("file {} has been saved".format(fname))
update the display window to show the drawing
pg.display.flip()
event loop and exit conditions
(press escape key or click window title bar x to exit)
while True:
    for event in pg.event.get():
        if event.type == pg.QUIT:

        # most reliable exit on x click
        pg.quit()
        raise SystemExit
    elif event.type == pg.KEYDOWN:
        # optional exit with escape key
        if event.key == pg.K_ESCAPE:
            pg.quit()
            raise SystemExit</pre>