save project

my_tree.py

@@ -11,19 +11,21 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
-pen.foward(100)
-pen.right(30)
-pen.foward(50)
-pen.up()
-pen.backward(50)
-pen.down()
-pen.left(60)
-pen.foward(50)
-pen.up()
-pen.backward(50)
-pen.left(-60)
-pen.backward(100)
-
+def tree(n):
+    if n <= 50:
+        pen.foward(n)
+        pen.right(30)
+        pen.foward(n-10)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+        pen.left(60)
+        pen.foward(n-10)
+        pen.up()
+        pen.backward(n)
+        pen.right(30)
+        pen.backward(n)
 
+tree(50)
 
 turtle.done()
\ No newline at end of file