auto save

my_tree.py

 import turtle
+import random
 
 pen = turtle.Turtle()
 pen.color('sienna')
@@ -12,4 +13,53 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
+#pen.forward(100)
+#pen.right(30)
+#pen.forward(50)
+#pen.up()
+#pen.backward(50)
+#pen.down()
+#pen.left(60)
+#pen.forward(50)
+#pen.up()
+#pen.backward(50)
+#pen.right(30)
+#pen.backward(100)
+#pen.down()
+ 
+def terr(n):
+    if n>=0:
+        if n<=12:
+            color=random.choice(["snow","lightcoral"])
+            pen.color(color)
+            pen.pensize(n/3)
+            pen.forward(n)
+            angle=random.randint(0,30)
+            length=random.randint(0,15)
+            pen.right(angle)
+            terr(n-length)
+            pen.left(2*angle)
+            terr(n-length)
+            pen.right(angle)
+            pen.up()
+            pen.backward(n)
+            pen.down()
+        else:
+            pen.color("sienna")
+            pen.pensize(n/10)
+            pen.forward(n)
+            angle=random.randint(0,30)
+            length=random.randint(0,15)
+            pen.right(angle)
+            terr(n-length)
+            pen.left(2*angle)
+            terr(n-length)
+            pen.right(angle)
+            pen.up()
+            pen.backward(n)
+            pen.down()
+terr(60)
 turtle.done()
+
+
+