pygame how to draw a rectangle

window = pygame.display.set_mode(300, 300)
colour = (0,0,255) #green
circle_x_&_y = (150, 50)
circle_radius = 12
border_width = 0 #0 = filled circle

pygame.draw.circle(window, colour, circle_x_&_y, circle_radius, border_width)

import pygame, sys
from pygame.locals import *

def main():
    pygame.init()

    DISPLAY=pygame.display.set_mode((500,400),0,32)

    WHITE=(255,255,255)
    BLUE=(0,0,255)

    DISPLAY.fill(WHITE)

    pygame.draw.rect(DISPLAY,BLUE,(200,150,100,50))

    while True:
        for event in pygame.event.get():
            if event.type==QUIT:
                pygame.quit()
                sys.exit()
        pygame.display.update()

main()

pygame.draw.rect(surface, color, rect)

 pygame.draw.rect(DISPLAY,BLUE,(200,150,100,50))