auto save

my_tree.py

 import turtle
 import turtle
+import random
 
 
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
@@ -6,10 +7,35 @@ pen.color('sienna')
 w = turtle.Screen()
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 w.bgcolor('wheat')      # wheat小麦
 
 
+def tree(n):
+    if n>=0:
+        if n<=12:
+            c = ['snow','lightcoral']
+            pen.pencolor(random.choice(c))
+            pen.pensize(n/3)
+        else:
+            pen.pencolor("sienna")  
+            pen.pensize(n/10)  
+            pen.forward(n)
+            angle = random.randint(0,30)
+            len = random.randint(1,15)
+            pen.right(angle)
+            tree(n-len)
+            pen.left(2*angle)
+            tree(n-len)
+            pen.right(angle)
+            pen.up()
+            pen.backward(n)
+            pen.down()
+
+
 # 移动到起点
 # 移动到起点
 pen.left(90)
 pen.left(90)
 pen.up()
 pen.up()
-pen.backward(150)    # 后退
+pen.backward(200)    # 后退
 pen.down()
 pen.down()
 
 
+tree(60)
+
+
 turtle.done()
 turtle.done()