save project

my_tree.py

 import turtle
+import random
+
+def tree(n):
+    if n >=0:
+        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()
+
 
 pen = turtle.Turtle()
 pen.color('sienna')
@@ -12,16 +26,6 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
+tree(60)
 turtle.done()
 
-def tree(n)
-    if n >=50:
-        pen.forward(n)
-        pen.right(30)
-        tree(n-50)
-        pen.left(60)
-        tree(n-5)
-        pen.right(30)
-        pen.up()
-        pen.backward(n)
-