save project

my_tree.py

@@ -12,7 +12,7 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
-def tree(n)
+def tree(n):
     if n>=50:
         pen.forward(n)
         pen.right(30)
@@ -20,8 +20,8 @@ def tree(n)
         pen.left(60)
         tree(n-10)
         pen.right(30)
-        pen.up
+        pen.up()
         pen.backward(n)
-        pen.down
+        pen.down()
 tree(100)
 turtle.done
\ No newline at end of file