save project

my_tree.py

 import turtle
+import random
 
 pen = turtle.Turtle()
 pen.color('sienna')
@@ -7,19 +8,28 @@ w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 
 def tree(n):
-    if n>=50:
-        pen.forward(100)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
+    if n>=0:
+        if n<=12:
+            pen.color(random.choice(['snow','lightcoral']))
+            pen.pensize(n/3)
+        else:
+            pen.pensize(n/10)
+            pen.color('sienna')
+        pen.forward(n)
+        angle=random.randint(0,30)
+        lenth=random.randint(1,15)
+        pen.right(angle)
+        tree(n-lenth)
+        pen.left(2*angle)
+        tree(n-lenth)
+        pen.penup()
+        pen.right(angle)
         pen.backward(n)
-        pen.backward(50)
-    
+        pen.down()
+        
 pen.left(90)
 pen.penup()
 pen.backward(50)
 pen.down()
-tree(100)
+tree(60)
 turtle.done()