save project

diy2.py

-# 尝试编写func()函数输出斐波那契数列的第十五个数是什么？
-# 斐波那契数列：1，1，2，3，5，8，13，21，34，55……
-def func(n):
-    if n<=2:
-        return 1
-    elif n>2:
-        n=func(n-1)+func(n-2)
-        return n
-print(func(15))
+import turtle
+import random
+
+pen =turtle.Turtle()
+pen.color('sienna')
+pen.speed(0)
+
+w = turtle.Screen()
+w.bgcolor('wheat')
+
+pen.left(90)
+pen.up()
+pen.backward(150)
+pen.down()
+
+def tree(n):
+    if n<=0:
+        if n <=12:
+            color_list = ['show','lightcoral']  
+            color = random.choice(color_list)
+            pen.color(color)
+            pen.pansize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+        pen.forward(n)
+        angle = random.random()
+        pen.right(30*angle)
+        lenght = 1.5*random.random()
+        tree(n-10*lenght) 
+        pen.left(60*angle)
+        tree(n-10*lenght) 
+        pen.right(30*angle)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
+tree(60)
+turtle.done() 
     
     
    
    
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