Making a random coordinate generator

This code was originally meant for user input, however I want it to randomly create a polygon rather than manually selecting points myself. I'll probably make it a for loop rather than a while loop so you needn't mention that. import pygame from pygame.locals import * from sys import exit import random from random import *

pygame.init()
screen = pygame.display.set_mode((640, 480), 0, 32)
points = []


while True:

    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            exit()
        point1 = randint(0,639)
        point2 = randint(0,479)
        points = (str(randint(0,639)), str(randint(0,479)))

    screen.fill((255,255,255))

        if len(points) >= 3:
            pygame.draw.polygon(screen, (0,255,0), points)
        for point in points:
            pygame.draw.circle(screen, (0,0,255), point, 5)

            pygame.display.update()

What I am attempting to do is make a coordinate point randomiser, however it isn't compatible with this code for some reason. I have tried other things as well, and remnants of those attempts may be visible. The segment I changed goes from the for event in pygame.event.getto the screen.fill((255,255,255)). The original code there went like this:

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

    if event.type == MOUSEBUTTONDOWN:
        points.append(event.pos)

    screen.fill((255,255,255))

When I run the program I get a

Traceback (most recent call last):
  File "H:/Documents/it/Python/manual_box drawer.py", line 26, in <module>
    pygame.draw.circle(screen, (0,0,255), point, 5)
TypeError: must be 2-item sequence, not int

error report.