[Tutor] loop couldn't work well and file couldn't close

[Dave Angel]

baidusandy <baidusandy at 126.com> Wrote in message:

[invisible message not copied here]

By posting in html, you managed to pick black on black text.  I
 literally could see none of your message except the boilerplate. 
 Please tell your email program to use text mode.


-- 
DaveA