save project

my_tree.py

@@ -8,12 +8,22 @@ w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 def tree(n):
     if n>=0:
+        if n <15:
+            color=['snow','green']
+            asd=random.choice(color)
+            pen.color(asd)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+            
         pen.forward(n)
-        pen.right(30)
+        angle=random.randint(15,40)
+        pen.right(angle)
         tree(n-10)
-        pen.left(60)
+        pen.left(2*angle)
         tree(n-10)
-        pen.right(30)
+        pen.right(angle)
         pen.up()
         pen.backward(n)
         pen.down()
@@ -22,6 +32,6 @@ pen.left(90)
 pen.up()
 pen.backward(150) 
 pen.down()   # 后退
-
-tree(100)
+pen.speed(0)
+tree(60)
 turtle.done()
\ No newline at end of file