请帮我用turtle库生成一朵向日葵

好的，以下是代码实现：

import turtle

# 画一个圆形，用于画向日葵的花盘
def draw_circle():
    turtle.penup()
    turtle.goto(0,-100)
    turtle.pendown()
    turtle.circle(100)

# 画向日葵的花瓣
def draw_petals(num_petals):
    angle = 360 / num_petals
    for i in range(num_petals):
        turtle.setheading(i * angle)
        turtle.forward(100)
        turtle.setheading(180 + i * angle)
        turtle.circle(50, -angle)

# 画向日葵的花蒂和叶子
def draw_stem_and_leaves():
    turtle.penup()
    turtle.goto(0,-100)
    turtle.pendown()

    turtle.setheading(90)
    turtle.forward(100)
    turtle.right(90)
    turtle.forward(20)

    turtle.penup()
    turtle.goto(0,-100)
    turtle.pendown()

    turtle.setheading(270)
    turtle.forward(80)
    turtle.right(120)
    turtle.forward(40)
    turtle.right(150)
    turtle.forward(40)

# 设置画布大小和画笔速度
turtle.setup(width=600, height=600)
turtle.speed('fastest')

# 画一朵有12条花瓣的向日葵
draw_circle()
draw_petals(12)
draw_stem_and_leaves()

turtle.done()

希望你喜欢这朵向日葵！