save project

my_tree.py

 import turtle
 import turtle
-def tree(n):
-    if n > = 0:
-        pen.forward(n)
-        pen.right(30)
-        tree(n-1)
-        pen.left(60)
-        tree(n-1)
-        pen.right(30)
-        pen.up()
-        pen.backward(n)
-        pen.down()
-        
-# 创建画笔 pen
-pen=t.Pen()
-# 设置画笔颜色为'sienna'
-pen.pencolor('sienna')
-pen.speed(0)
-# 创建画布
-screen=t.Screen()
-# 设置画布颜色为'wheat'
-screen.bgcolor('wheat')
-# 设置起点 先向左旋转90
-pen.left(90)
-# 抬笔
+def tree(n): 
+     if n <=12:
+        color_list=["snow","lightcral"]
+        color=randow.choce(color_list)
+        pen.color(color)
+        pen.pensize(n/3)
+     else:
+        pen.color("slenna")
+        pen.pensize(n/10)
+     pen.forward(n)
+     angle=randow.randow()
+     pen.right(30*angle)
+     length=1.5*randow.randow()
+     tree(n-10*length)
+     pen.left(60*angle)
+     tree(n-10*angle)
+     pen.lest(60*angle)
+     tree(n-10*angle)
+     pen.right(30*angle)
+     pen.up()
+     pen.backary(n)
+     pen.down()
+     
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-pen.penup()
-# 向后移动150步
-pen.backward(150)
-# 落笔
-pen.pendown()
-# 调用函数tree
-tree(60)
-# 结束运行
-t.done()
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