save project

my_tree.py

@@ -4,16 +4,18 @@ pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
-w.bgcolo(('wheat')      # wheat小麦
-def =tree(n):
-    if>=50
+w.bgcolor('wheat')      # wheat小麦
+def tree(n):
+    if n>=50:
+        pen.pendown()
         pen.forward(n)
         pen.right(30)
         tree(n-10)
         pen.left(60)
+        tree(n-10)
         pen.right(30)
         pen.backward(n)
-        pen.pen
+        pen.penup
 # 移动到起点
 pen.left(90)
 pen.up()