auto save

my_tree.py

 import turtle
+import random
 
 pen = turtle.Turtle()
 pen.color('sienna')
@@ -9,7 +10,30 @@ w.bgcolor('wheat')      # wheat小麦
 # 移动到起点
 pen.left(90)
 pen.up()
-pen.backward(150)    # 后退
+pen.backward(350)    # 后退
 pen.down()
-
+pen.speed(0)
+#  snow雪白  coral #珊瑚
+def tree(n):
+    if n >= 0:
+        if n <= 15:
+            color_list = ['snow','lightcoral']
+            color = random.choice(color_list)
+            pen.color(color)
+            pen.pensize(n/5)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/15)
+        angle = random.randint(0,20)
+        len =random.randint(1,15)
+        pen.fd(n)
+        pen.right(angle)
+        tree(n-len)
+        pen.left(2*angle)
+        tree(n-len)
+        pen.right(angle)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(100)
 turtle.done()