# 圣诞节教你用Python绘制爱心圣诞树

```# -*- coding: utf-8 -*-
"""
Created on Sat Dec 12 12:29:09 2020

@author: haoyu
"""

import turtle as t
import random
# 爱心函数
# 将爱心分为两个半圆与一个正方形
# r为半圆半径，l = 2r为正方形边长
# 调整半径即可调整爱心大小
def loving_heart(r):
l = 2 * r
t.left(45)
t.forward(l)
t.circle(r, 180)
t.right(90)
t.circle(r, 180)
t.forward(l)

# 树函数(递归)
def tree(d, s):
if d <= 0:
return
t.forward(s)
tree(d - 1, s * .8)
t.right(120)
tree(d - 3, s * .5)
t.right(120)
tree(d - 3, s * .5)
t.right(120)
t.backward(s) #回退函数

#画爱心部分
t.penup()
t.goto(0,200) #设置起点位置
t.pendown()
t.pencolor("pink") #设置画笔颜色
t.color("pink")
t.begin_fill() #对图形进行填充
loving_heart(20) #执行画爱心函数
t.end_fill()

#画树部分
n = 100
t.speed("fastest")
#t.Turtle().screen.delay(0)
t.right(225)
t.color("dark green")
t.backward(n * 4.8)
tree(15, n)
t.backward(n / 5)

#绘制落叶
for i in range(200):
a = 200 - 400 * random.random()
b = 10 - 20 * random.random()
t.up()
t.forward(b)
t.left(90)
t.forward(a)
t.down()
if random.randint(0, 1) == 0:
t.color("tomato")
else:
t.color("wheat")
t.circle(2)
t.up()
t.backward(a)
t.right(90)
t.backward(b)
t.hideturtle()
```

```height = 5

stars = 1

for i in range(height):

print((" " * (height - i)) + ("*" * stars))

stars += 2

print((" " * height) + "|")```

``` import turtle

screen = turtle.Screen()

screen.setup(800,600)

circle = turtle.Turtle()

circle.shape("circle")

circle.color("red")

circle.speed("fastest")

circle.up()

square = turtle.Turtle()

square.shape("square")

square.color("green")

square.speed("fastest")

square.up()

circle.goto(0,280)

circle.stamp()

k = 0

for i in range(1, 17):

y = 30*i

for j in range(i-k):

x = 30*j

square.goto(x,-y+280)

square.stamp()

square.goto(-x,-y+280)

square.stamp()

if i % 4 == 0:

x = 30*(j+1)

circle.color("red")

circle.goto(-x,-y+280)

circle.stamp()

circle.goto(x,-y+280)

circle.stamp()

k += 2

if i % 4 == 3:

x = 30*(j+1)

circle.color("yellow")

circle.goto(-x,-y+280)

circle.stamp()

circle.goto(x,-y+280)

circle.stamp()

square.color("brown")

for i in range(17,20):

y = 30*i

for j in range(3):

x = 30*j

square.goto(x,-y+280)

square.stamp()

square.goto(-x,-y+280)

square.stamp()

turtle.exitonclick()```