save project

my_tree.py

@@ -11,5 +11,31 @@ pen.left(90)
 pen.up()
 pen.backward(150)    # 后退
 pen.down()
+pen.forward(100)
+pen.right(30)
+pen.forward(50)
+pen.backward(50)
+pen.left(780)
+pen.forward(50)
+pen.backward(50)
+pen.right(30)
+pen.backward(100)
+
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 turtle.done()