save project

my_tree.py

 import turtle
+import random
 
 def tree(n):
     if n>0:
+        if n <=12:
+            color_list = ["snow","lightcoarl"]
+            c = random.choice(color_list)
+            pen.color(c)
+            pen.pensize(n/3)
+        else:
+            pen.color("sienna")
+            pen.pensize(n/10)
+        pen.pensize(n/10)
         pen.forward(n)
-        pen.right(60)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
+        a=random.randint(0,30)
+        b=random.randint(0,15)
+        pen.right(a)
+        tree(n-b)
+        pen.left(2*a)
+        tree(n-b)
+        pen.right(a)
+        
         pen.up()
         pen.backward(n)
         pen.down()
+        
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
@@ -22,18 +36,7 @@ pen.left(90)
 pen.up()
 pen.backward(150)    # 后退
 pen.down()
-pen.forward(100)
-pen.right(30)
-pen.forward(50)
-pen.up()
-pen.backward(50)
-pen.down()
-pen.left(60)
-pen.forward(50)
-pen.up()
-pen.goto(0,-150)
-pen.down()
-pen.right(30)
+
 
 tree(60)
 turtle.done()