circle.py

import pygame

BLACK = (0,0,0)
RED = (255, 0, 0)

screen = pygame.display.set_mode([450, 600])

another_loop = True
clock = pygame.time.Clock()
  
while another_loop:
    # --- Basic Event Processing
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            another_loop = False

    # Every loop we will wipe the screen and redraw images
    screen.fill(BLACK)

    #Draw the new screen here:
    pygame.draw.circle(screen, RED, (50, 50), 30)
 
    #This sets the frames per second
    clock.tick(60)
 
    #This puts the new stuff you've drawn on screen
    pygame.display.flip()

#When we've left the while loop exit pygame 
pygame.quit()