On 18/10/14 19:36, George R Goffe wrote:
When you run a python program, it appears that stdin, stdout, and stderr are opened automatically.
correct.
I've been trying to find out how you tell if there's data in stdin
Same way you tell if there's data in any file/stream - you read from it. In the old days when I programmed in C there were a pair of calls often used for this: getc() and ungetc(). You read a character with getc() then pout it back with ungetc(). Unfortunately they don't exist in Python stdlib. But, there is a getch()/ungetch() in the msvcrt for Windows, so you could use that. The curses module on linux has an ungetch() but no getch() - which seems bizarre... Steven has posted a solution using read(1) but that blocks so you need to use the isatty() method which all seems a bit messy and doesn't work with tty input. On further investigation the curses.screen object has a getch() method, but its not clear how the curses.ungetch() relates to that (there's no help() documentation) and I've run out of time to experiment. But if you need a linux solution that works with any kind of stdin that might be worth exploring. Sorry, not a great answer but hopefully its of some use. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.flickr.com/photos/alangauldphotos _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
