auto save

my_tree.py

+from turtle import *
+from random import *
+
+def tree(n):
+    if n >= 0:
+        pen.fd(n)
+        pen.rt(30)
+        tree(n - 10)
+        pen.lt(60)
+        tree(n - 10)
+        pen.rt(30)
+        pen.pu()
+        pen.bk(n)
+        pen.pd()
+
+pen = Pen()
+pen.color('sienna')
+#pen.ht()
+# 画布大小
+w = Screen()
+w.bgcolor('wheat')      # wheat小麦
+# 移动到起点
+pen.lt(90)
+pen.pu()
+pen.bk(150)    # 后退
+pen.pd()
+
+tree(50)
+
+done()