save project

my_tree.py

@@ -16,12 +16,12 @@ def tree(n):
         pen.up()
         pen.backward(n)    # 后退
         pen.down()
-        if s<=12:
+        if l<=12:
             pen.color(c)
-            pen.pensize(s/3)
+            pen.pensize(l/3)
         else:
             pen.color("sienna")
-            pen.pensize(s/10)
+            pen.pensize(l/10)
 pen = turtle.Turtle()
 # 画布大小
 w = turtle.Screen()