python打印一颗桃花树

以下是使用Python的turtle库来绘制一棵梅花树，并添加

落叶效果的代码：

import turtle
import random

# 设置画布和画笔
canvas = turtle.Screen()
canvas.bgcolor("black")
pen = turtle.Turtle()
pen.speed(0)
pen.penup()
pen.left(90)
pen.backward(200)
pen.pendown()

# 定义绘制树枝的函数
def branch(t, branch_len):
    if branch_len < 3:
        pen.color("green")
    else:
        pen.color("brown")

    if branch_len < 10:
        pen.color("orange")

    if branch_len > 2:
        angle = random.randint(20, 40)
        length = random.randint(15, 25)
        pen.pensize(branch_len / 10)
        pen.forward(branch_len)
        pen.left(angle)
        branch(t, branch_len - length)
        pen.right(angle * 2)
        branch(t, branch_len - length)
        pen.left(angle)
        pen.backward(branch_len)


def leaf():
    pen.color("red")
    pen.shape("turtle")
    pen.stamp()


# 绘制树枝和落叶
def