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my_tree.py

 import turtle
 import turtle
-import random  #!!!!!!!!!!!!!
-def tree(n):#画树枝
-    if n>0:
-        if n<=12:#该画樱花了
-            color_list=['snow','lightcoral']
-            color= random.choice(color_list)
-            pen.color(color)
-            pen.pensize(n/3)
-        else:  #n还没有小于12说明需要画树枝
-            pen.color('sienna')
-            pen.pensize(n/10)  # 基数比较大所以不会被樱花盖住
-        pen.forward(n)
-        angle=random.random()#在0-1之间取出一个随机数
-        pen.right(30*angle) #让画笔旋转随机实现不同弯曲
-        length=1.5*random.random()  
-        tree(n-10*length)  #是用来画小树枝的分叉
-        pen.left(60*angle) #画左边小树枝
-        tree(n-10*length)#是用来画小树枝的分叉
-        pen.right(30*angle)
-        pen.up('
-        
-        3')
-        pen.backward(n)
-        pen.down()
+import random  
+
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.pensize(6)
 pen.pensize(6)
 pen.speed(0)
 pen.speed(0)
@@ -36,17 +14,29 @@ pen.left(90)
 pen.up()
 pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
-# turtle.tracer(False)
+turtle.tracer(False)#跳过步骤,得到画完之后的效果
+def tree(n):
+    if n>=0: #设置一个出口
+        if n<=12:#树枝很短了该画樱花了
+            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()#设置一个0到1的随机数
+        pen.right(30*angle)
+        lenght=1.5*angle
+        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)
 tree(60)
 
 
-# pen.forward(100)
-# pen.right(30)
-# pen.forward(50)
-# pen.backward(50)
-# pen.left(60)
-# pen.forward(50)
-# pen.backward(50)
-# pen.right(30)
-# pen.backward(100)
-
 turtle.done()
 turtle.done()