save project

my_tree.py

 import turtle
+import random
+
 pen = turtle.Turtle()
 def tree(n):
-    if n>=0:
+    if n > 0:
         pen.forward(n)
         pen.right(30)
         tree(n-10)
         pen.left(60)
         tree(n-10)
         pen.right(30)
-        pen.penup()
         pen.backward(n)
-        pen.pendown()
 
 pen.color('sienna')
 # 画布大小
@@ -22,8 +22,9 @@ pen.left(90)
 pen.up()
 pen.backward(150)    # 后退
 pen.down()
-pen.speed(0)
+# pen.speed(0)
+pen.pensize(3)
 
-tree(100)
+tree(60)
 
 turtle.done()