save project

my_tree.py

 import turtle
 
-pen = turtle.Turtle()
+def tree(n):
+    if n>=50:
+        pen.forward(n)
+        pen.right(30)
+        tree(n-1)
+        pen.left(60)
+        treen(n-10)
+        pen.right(30)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
+        pebpen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
@@ -12,7 +24,7 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
-pen.forward(100)
+pen.forward(100) 
 pen.right(30)
 pen.forward(50)
 pen.up()