auto save

my_tree.py

 import turtle
-
+import random
 def tree(n):
-    if n>=50:
+    if n>=0:
+        if n<=12:
+            color_list=['snow','lightcoral']
+            color=random.choice(color_list)
+            pen.color(color)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
         pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
+        angle=random.random()
+        pen.right(30*angle)
+        lenth=1.5*random.random()
+        tree(n-10*lenth)
+        pen.left(60*angle)
+        tree(n-lenth)
+        pen.right(30*angle)
         pen.up()
         pen.backward(n)
         pen.down()
@@ -15,6 +25,7 @@ def tree(n):
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
+pen.speed(20)
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 # 移动到起点
@@ -22,6 +33,6 @@ pen.left(90)
 pen.up()
 pen.backward(200)
 pen.down()
-tree(100)
+tree(60)
 pen.hideturtle()
 turtle.done()