[Tutor] A question about using stdin/out/err vs named files
Hi, Wow. Lots of feedback. REALLY GOOD FEEDBACK! This was my first question to this list. Let me clarify my question. I want to use tst.py as follows: tst.py input-file output-file OR cat data-file | tst.py - output-file OR cat data-file | tst.py output-file tst.py input-file output-file works well tst.py - output-file works well The question boils down to "tst.py output-file"... which is a "parsing the args" question which you "guys" have caused me to think more clearly about. If there's just 1 arg, consider it an output-file and read from stdin and write to output-file ONLY if output-file does not exist. Thank you all for your very helpful and informative responses. Regards, George... ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] A question about using stdin/out/err vs named files
Hi, When you run a python program, it appears that stdin, stdout, and stderr are opened automatically. I've been trying to find out how you tell if there's data in stdin (like when you pipe data to a python program) rather than in a named input file. It seems like most/all the Unix/Linux commands are able to figure this out. Do you know how Python programs do this or might do this? MANY thanks for any/all help/hints/tips/suggestions, George... ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
