save project

my_tree.py

-import turtle
-import random
-pen = turtle.Turtle()
-pen.color('sienna')
-# 画布大小
-w = turtle.Screen()
-w.bgcolor('wheat')      # wheat小麦
-pen.speed(-0.0001)
-# 移动到起点
-def tree(n):
-    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)
-        angle=random.random()
-        pen.right(30*angle)
-        length=1.5*random.random()
-        tree(n-10*length)
-        pen.left(60*angle)
-        tree(n-10*length)
-        pen.right(30*angle)
-        pen.up()
-        pen.backward(n)
-        pen.down()
-pen.hideturtle()
-pen.left(90)
-pen.up()
-pen.backward(150)    # 后退
-pen.down()
-#
-tree(70)
-turtle.done()
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