使用python图形模块turtle库绘制樱花、玫瑰、圣诞树代码

绘制樱花的代码：
```python
import turtle
# 设置画布大小
turtle.setup(800, 600)
# 画樱花的枝干
def draw_branch(branch_len):
if branch_len > 3:
# 设置画笔粗细和颜色
turtle.pensize(branch_len / 3)
turtle.pencolor('brown')
# 画右边的枝干
turtle.forward(branch_len)
turtle.right(20)
draw_branch(branch_len - 15)
# 画左边的枝干
turtle.left(40)
draw_branch(branch_len - 15)
# 返回树干处
turtle.right(20)
turtle.backward(branch_len)
# 画樱花的花瓣
def draw_petal():
turtle.pensize(2)
turtle.pencolor('pink')
turtle.fillcolor('pink')
# 开始填充
turtle.begin_fill()
turtle.left(60)
turtle.forward(30)
turtle.right(60)
turtle.circle(60, 120)
turtle.right(60)
turtle.forward(30)
turtle.end_fill()
# 移动画笔到指定位置
def move_pen(x, y):
turtle.penup()
turtle.goto(x, y)
turtle.pendown()
# 主函数
def main():
# 隐藏画笔
turtle.hideturtle()
# 设置速度和角度
turtle.speed(5)
turtle.left(90)
# 画樱花的枝干
move_pen(0, -200)
draw_branch(100)
# 画樱花的花瓣
move_pen(0, 0)
for _ in range(6):
draw_petal()
turtle.left(60)
# 关闭画布
turtle.done()
if __name__ == '__main__':
main()
```
绘制玫瑰的代码：
```python
import turtle
# 设置画布大小
turtle.setup(800, 600)
# 画玫瑰
def draw_rose():
turtle.speed(10)
turtle.pensize(2)
turtle.pencolor('red')
# 画玫瑰的花瓣
for _ in range(18):
turtle.forward(100)
turtle.left(100)
turtle.forward(100)
turtle.right(160)
# 画玫瑰的花蕊
turtle.fillcolor('yellow')
turtle.begin_fill()
turtle.circle(10)
turtle.end_fill()
# 移动画笔到指定位置
def move_pen(x, y):
turtle.penup()
turtle.goto(x, y)
turtle.pendown()
# 主函数
def main():
# 隐藏画笔
turtle.hideturtle()
# 画玫瑰
move_pen(0, 0)
draw_rose()
# 关闭画布
turtle.done()
if __name__ == '__main__':
main()
```
绘制圣诞树的代码：
```python
import turtle
# 设置画布大小
turtle.setup(800, 600)
# 画圣诞树
def draw_tree():
turtle.speed(10)
turtle.pensize(3)
turtle.pencolor('green')
# 画树干
turtle.fillcolor('brown')
turtle.begin_fill()
turtle.left(90)
turtle.forward(100)
turtle.right(90)
turtle.backward(10)
turtle.right(90)
turtle.forward(10)
turtle.right(90)
turtle.backward(20)
turtle.right(90)
turtle.forward(10)
turtle.right(90)
turtle.backward(10)
turtle.right(90)
turtle.forward(100)
turtle.end_fill()
# 画树叶
turtle.fillcolor('green')
turtle.begin_fill()
turtle.left(180)
turtle.circle(100, -180)
turtle.right(180)
turtle.forward(100)
turtle.right(60)
turtle.circle(80, -180)
turtle.right(180)
turtle.forward(80)
turtle.right(120)
turtle.circle(80, -180)
turtle.right(180)
turtle.forward(80)
turtle.right(60)
turtle.circle(100, -180)
turtle.end_fill()
# 移动画