save project

my_tree.py

@@ -13,4 +13,25 @@ pen.backward(150)    # 后退
 pen.down()
 
 turtle.done()
-def
\ No newline at end of file
+def tree(n)
+    if n >= 50
+        pen.forward(n)
+        pen.right(30)
+        tree(n-50)
+        pen.right(30)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(100)
+turtle.done()
+
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