auto save

my_tree.py

 import turtle
 import turtle
-
+import random
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
+pen.speed(0)
 # 画布大小
 # 画布大小
 w = turtle.Screen()
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 w.bgcolor('wheat')      # wheat小麦
@@ -13,14 +14,24 @@ pen.backward(150)    # 后退
 pen.down()
 pen.down()
 def tree(n):
 def tree(n):
     if n>=0:
     if n>=0:
+        if n <= 12:
+            color_list=["snow","lightcoral"]
+            c=random.choice(color_list)
+            pen.color(c)
+            pen.pensize(n/3)
+        else:
+            pen.color("sienna")
+            pen.pensize(n/10)
         pen.forward(n)
         pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
-        pen.penup()
-        pen.backward(100)
-        pen.pendown()
+        a=random.random()
+        pen.right(30*a)
+        t=1.5*random.random()
+        tree(n-10*t)
+        pen.left(60*a)
+        tree(n-10*t)
+        pen.right(30*a)
+        pen.up()
+        pen.backward(n)
+        pen.down()
 tree(60)
 tree(60)
 pen.done()
 pen.done()