I'm trying to detect and intelligently deal with problems created when a user of a Python CGI page uploads a file and then gets impatient and clicks on some other button or the browser's cancel button (or even closes the page). If the file is large enough, and the user is impatient enough, this can result in the FieldStorage.file object getting some, but not all of the bytes from the user's file, with no documented means of detecting that this has happened. Poking around in the code for cgi.py in the standard library, it appears that there is an undocumented 'done' attribute which might be useful here (it seems as if it might get set to -1 when this condition is encountered), but of course one is reluctant to leave behind software which relies on undocumented behavior of packages, since those bits have a way of disappearing in the middle of the night, suddenly breaking one's software. Can anyone think of a good reason why it would not be desirable to expose a publicly documented means of detecting the condition described above?
Cheers and thanks! Bob Kline -- http://mail.python.org/mailman/listinfo/python-list
