save project

my_tree.py

@@ -13,15 +13,23 @@ pen.backward(150)    # 后退
 pen.down()
 
 def tree(n):#pen.right(30)
-    if n>=50:#pen.forward(100)
-        pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
-        pen.up
-        pen.backward(n)
-        pen.down()
-tree(100)
-turtle.done()
+    if n>=0
+        if n<=12:#pen.forward(100)
+            color_list = ['snow','lightcoral']
+            color = random.choice(color_list)
+            pen.color(color)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+            pen.forward(n)
+            pen.right(angle)
+            tree(n-length)
+            pen.left(2*angle)
+            tree(n-length)
+            pen.right(angle)
+            pen.up()
+            pen.backward(n)
+            pen.down()
+    tree(60)
+    turtle.done()