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()

效果图

import turtle
# 定义圣诞树的绿叶函数
def tree(d, s):
    if d <= 0:
        return
    turtle.forward(s)
    tree(d - 1, s * .8)
    turtle.right(120)
    tree(d - 3, s * .5)
    turtle.right(120)
    tree(d - 3, s * .5)
    turtle.right(120)
    turtle.backward(s)
n = 100
""" 设置绘图速度
'fastest' :  0
'fast'    :  10
'normal'  :  6
'slow'    :  3
'slowest' :  1
"""
turtle.speed('fastest') # 设置速度
turtle.left(90)
turtle.forward(3 * n)
turtle.color("orange", "yellow")
turtle.left(126)
# turtle.begin_fill()
for i in range(5):
    turtle.forward(n / 5)
    turtle.right(144)
    turtle.forward(n / 5)
    turtle.left(72)
    turtle.end_fill()
turtle.right(126)
turtle.color("dark green")
turtle.backward(n * 4.8)
# 执行函数
tree(15, n)
turtle.backward(n / 5)

效果图