Make a chase game with pyGame

Hello, everyone , Today, let's play a chase game

1、 Use the mouse to operate

2、 Left click to change color （ Random ）

3、 The wheel adjusts the size of the sphere （ Go up , Lower ）

4、 Right click to clear the screen

import sys
import pygame as p
from random import * 

p.init()     #pygame initialization 

 The screen  = p.display.set_mode( (800,800) )  # Set up the screen 

p.display.set_caption(" Chase the game ")
 Frame rate  = p.time.Clock()

 red , green , blue =255,100,100
 radius =50
gx,gy=50,50
while True:
    for event in p.event.get():
        #print(event)
        #p.MOUSEBUTTONDOWN     Mouse button down 
        #p.MOUSEBUTTONUP       Release the mouse button 
        #p.MOUSEMOTION         Mouse movement 

        if event.type == p.QUIT:    # If the type of event is exit 
            p.quit()                # Then quit （pygame）
            sys.exit()              # Then quit （）

        if event.type == p.MOUSEBUTTONDOWN:
            if event.button == 3:
                 The screen .fill( (0,0,0) )
            elif event.button == 4:
                 radius +=2
            elif event.button == 5:
                 radius -=2
                if  radius  <2:
                     radius  = 2
            elif event.button == 1:
                 red  = randint(0,255)
                 green  = randint(0,250)
                 blue  = randint(0,250)
        elif event.type == p.MOUSEMOTION:
            print(event.pos)
            x = event.pos
        # else:
        #      The screen .fill( (0,0,0) ) 

    if gx<x[0]:
        gx+=1
    else:
        gx-=1
    if gy<x[1]:
        gy+=1
    else:
        gy-=1

    p.draw.circle( The screen ,( red , green , blue ),( x[0], x[1]), radius ,0)

    p.draw.circle( The screen ,(255,255,255),(gx,gy),10,0)

    if   x[0]- radius  <= gx <= x[0]+ radius  and x[1]- radius <= gy <= x[1]+ radius :
         The screen .fill( (255,255,255) )

     Frame rate .tick(120)
    p.display.update()   # The refresh screen