auto save

my_tree.py

+import turtle
+def tree(n)
+    if n>=50
+        pen.forward()
+        angle=random.randint(0,30)
+        length=random.randint(1,15)
+        pen.right(angle)
+        tree(n-angle)
+        pen.left(2*angle)
+        tree(n-angle)
+        pen.right(angle)
+        pen.up()
+        pen.backward(n)    # 后退
+        pen.down()
+
+pen = turtle.Turtle()
+pen.color('sienna')
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+tree(60)
+pen.forward(200)
+pen.right(30)
+pen.forward(100)
+pen.forward(-100)
+pen.left(60)
+pen.forward(100)
+turtle.done()
+
+
+