我正在用Python制作一个抽象艺术模板生成器，该生成器接受最小半径，最大半径和圆数的输入。它在随机的地方绘制随机的圆，也符合用户的要求。我想将Turtle图形转换为PNG，以便用户随后可以按自己的意愿编辑模板，但是我不知道如何进行。这是我的代码：

import random  
import time  
import turtle

print("Abstract Art Template Generator")
print()
print("This program will generate randomly placed and sized circles on a blank screen.")
num = int(input("Please specify how many circles you would like to be drawn: "))
radiusMin = int(input("Please specify the minimum radius you would like to have: "))
radiusMax = int(input("Please specify the maximum radius you would like to have: "))
screenholder = input("Press ENTER when you are ready to see your circles drawn: ")

t = turtle.Pen()

win = turtle.Screen()


def mycircle():
    x = random.randint(radiusMin,radiusMax) 
    t.circle(x)

    t.up()
    y = random.randint(0,360)
    t.seth(y)
    if t.xcor() < -300 or t.xcor() > 300:
        t.goto(0, 0)
    elif t.ycor() < -300 or t.ycor() > 300:
        t.goto(0, 0)
    z = random.randint(0,100)
    t.forward(z)
    t.down()


for i in range(0, num):
    mycircle()


turtle.done()