auto save

my_tree.py

 import turtle
-
+import random
 
 
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.pensize(3)
+pen.speed(100)
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
@@ -17,14 +18,23 @@ pen.down()    # 后退
 
 
 def tree(n):
-    if n>=50:
+    if n>=0:
+        if n<=12:
+            color=['snow','lightcoral']
+            color=random.choice(color)
+            pen.color(color)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
         pen.forward(n)
-        pen.right(30)
-        tree(n-50)
-        pen.left(30)
-        pen.left(30)
-        tree(n-50)
-        pen.right(30)
+        angle=random.randint(0,30)
+        length=random.randint(1,15)
+        pen.right(angle)
+        tree(n-length)
+        pen.left(2*angle)
+        tree(n-length)
+        pen.right(angle)
         pen.up()
         pen.backward(n)
         pen.down()
@@ -41,5 +51,5 @@ def tree(n):
 # pen.up()
 # pen.backward(100)
 # pen.down()
-tree(100)
+tree(60)
 turtle.done()