Hi
when using an interactive Python script, I'd like the prompt given by
raw_input to go to stderr since stdout is redirected to a file.
How can I change this (and suggest making this the default behaviour)
Many thanks for a hint,
Helmut Jarausch
RWTH Aachen University
Germany 5 3000
"Helmut Jarausch" <ja************ *@igpm.rwth-aachen.de> wrote in message
news:bv******** **@nets3.rz.RWT H-Aachen.DE... when using an interactive Python script, I'd like the prompt given by raw_input to go to stderr since stdout is redirected to a file.
This is not the usual behavior, so I presume that you or the code author
(if not the same) have done some non-standard redirection.
How can I change this
If you wrote or have access to the code, write your own (two-line?) version
of raw_input(promp t) using stderror.write( prompt) and return stdin.read().
Or leave stdout alone and use print >> ofile or ofile.write() for the other
stuff. Ofile can easily be selectable as either stdout or something else.
If you don't have the source, make suggestions to the owner/author.
(and suggest making this the default behaviour)
You just did, but part of the definition of 'interactive' is stdout to the
screen or other humanly immediately readable output device ;-)
Terry J. Reedy
Terry Reedy wrote: "Helmut Jarausch" <ja************ *@igpm.rwth-aachen.de> wrote in message news:bv******** **@nets3.rz.RWT H-Aachen.DE...
when using an interactive Python script, I'd like the prompt given by raw_input to go to stderr since stdout is redirected to a file.
This is not the usual behavior, so I presume that you or the code author (if not the same) have done some non-standard redirection.
Ofcourse I did the redirection of stdout.
And here is an example which I give in my C++ courses when I tell the
students to use 'cerr' for outputting a prompt (in Python)
FileName= raw_input('plea se enter the name of data file')
input= open(FileName,' r')
....
print tons of output
And this is very handy.
While testing I don't redirect stdout and so can see the output
immediately. Then I just redirect stdout for a 'production' run.
Tell me any advantage in raw_input's prompt is going to stdout instead
of stderr?
Thanks for your comments,
Helmut.
--
Helmut Jarausch
Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany
Terry Reedy wrote: "Helmut Jarausch" <ja************ *@igpm.rwth-aachen.de> wrote in message news:bv******** **@nets3.rz.RWT H-Aachen.DE...
when using an interactive Python script, I'd like the prompt given by raw_input to go to stderr since stdout is redirected to a file.
This is not the usual behavior, so I presume that you or the code author (if not the same) have done some non-standard redirection.
Ofcourse I did the redirection of stdout.
And here is an example which I give in my C++ courses when I tell the
students to use 'cerr' for outputting a prompt (in Python)
FileName= raw_input('plea se enter the name of data file')
input= open(FileName,' r')
....
print tons of output
And this is very handy.
While testing I don't redirect stdout and so can see the output
immediately. Then I just redirect stdout for a 'production' run.
Tell me any advantage in raw_input's prompt is going to stdout instead
of stderr?
Thanks for your comments,
Helmut.
--
Helmut Jarausch
Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany
"Helmut Jarausch" <ja******@skyne t.be> wrote in message
news:40******** ******@skynet.b e... Ofcourse I did the redirection of stdout.
Since a program author can easily do so, as has been posted more than once
over the years, the question was real. In fact, the addition of '>>ofile'
to print statements was intended to make such redirection less common.
And this is very handy. While testing I don't redirect stdout and so can see the output immediately. Then I just redirect stdout for a 'production' run.
Tell me any advantage in raw_input's prompt is going to stdout instead of stderr?
I don't know the ramification of the distinction, expecially across
platforms, well enough to answer. I can only reiterate my suggestion,
given Python as it is today and will remain for some time, that you print
to 'ofile' with default ofile == sys.stdout but with command line or
interactive redirection.
Terry J. Reedy
Quoth "Terry Reedy" <tj*****@udel.e du>:
[... in response to]
|> Tell me any advantage in raw_input's prompt is going to stdout instead
|> of stderr?
|
| I don't know the ramification of the distinction, expecially across
| platforms, well enough to answer. I can only reiterate my suggestion,
| given Python as it is today and will remain for some time, that you print
| to 'ofile' with default ofile == sys.stdout but with command line or
| interactive redirection.
I don't know either, but agree that the cross platform point is
probably an issue. If it were strictly a UNIX application, I would
indeed expect prompt on stderr - as well as a lot of other stuff
that now goes to stdout. But I've heard complaints from the Windows
crowd that stderr output is a nuisance there in some way, and for
sure you couldn't expect MS to appreciate the virtue of this
distinction even if they do somehow observe it.
Donn Cave, do**@drizzle.co m This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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