1 import turtle
 2 import time
 3 def draw():
 4     try:
 5         screen = turtle.Screen()
 6         screen.setup(700,700)
 7         circle = turtle.Turtle()
 8         circle.shape('circle')
 9         circle.color('red')
10         circle.speed('fastest')
11         circle.up()
12         square = turtle.Turtle()
13         square.shape('square')
14         square.color('green')
15         square.speed('fastest')
16         square.up()
17         circle.goto(0,280)
18         circle.stamp()
19         k=0
20         for i in range(1,17):
21             y =30*i
22             for j in range(i - k):
23                     x=30*j
24                     square.goto(x, -y +280)
25                     square.stamp()
26                     square.goto(-x, -y +280)
27                     square.stamp()
28             if i%4== 0:
29                 x=30*(j+1)
30                 circle.color('red')
31                 circle.goto(-x, -y +280)
32                 circle.stamp()
33                 circle.goto(x,-y +280)
34                 circle.stamp()
35                 k+=3
36             if i% 4 == 3:
37                 x =30*(j+1)
38                 circle.color('yellow')
39                 circle.goto(-x, -y +280)
40                 circle.stamp()
41                 circle.goto(x,-y +280)
42                 circle. stamp()
43         square.color('brown')
44         for i in range(17,20):
45             y =30*i
46             for j in range(2):
47                 x=30*j
48                 square.goto(x,-y+280)
49                 square. stamp()
50                 square.goto(-x, -y +280)
51                 square.stamp()
52         y=[30*i for i in [0,4,8,12,16]]
53         x1=[30*i for i in [0,3,4,5,6]]
54         x2=[30*i for i in [0,4,5,6,7]]
55         c=1
56         # yellow=[[60,90],[90,210],[120,330],[150,450]]
57         # red=[[120,120],[150,240],[180,360],[210,480]]
58         while(True):
59             if 1==c:
60                 for i in range(5):
61                     if not i == 0:
62                         circle.color('red')
63                         circle.goto(-x1[i], -y[i] + 310)
64                         circle.stamp()
65                         circle.goto(x1[i], -y[i] + 310)
66                         circle.stamp()
67                     circle.color('yellow')
68                     circle.goto(-x2[i], -y[i] + 280)
69                     circle.stamp()
70                     circle.goto(x2[i], -y[i] + 280)
71                     circle.stamp()
72             else:
73                 for i in range(5):
74                     if not i == 0:
75                         circle.color('yellow')
76                         circle.goto(-x1[i], -y[i] + 310)
77                         circle.stamp()
78                         circle.goto(x1[i], -y[i] + 310)
79                         circle.stamp()
80                     circle.color('red')
81                     circle.goto(-x2[i], -y[i] + 280)
82                     circle.stamp()
83                     circle.goto(x2[i], -y[i] + 280)
84                     circle.stamp()
85 
86             c=c*-1
87     except:
88         exit()
89 
90 
91 def christmas_tree():
92     draw()
93 if __name__ == '__main__':
94     christmas_tree()