stdin -> stdout

[max(01)*]

hi.

i was wondering, what's the simplest way to echo the standard input to
the standard output, with no modification.

i came up with:

....
while True:
try:
raw_input()
except EOFError:
break
....

but i guess there must be a simpler way.

using bash i simply do 'cat', *sigh*!

bye

max

ps: in perl you ca do this:

....
while ($line = <STDIN>)
{
print STDOUT ("$line");
}
....

[limodou]

Re: stdin -&gt; stdout

2005/8/19, max(01)* <max2@fisso.cas a>:[color=blue]
> hi.
>
> i was wondering, what's the simplest way to echo the standard input to
> the standard output, with no modification.
>
> i came up with:
>
> ...
> while True:
> try:
> raw_input()
> except EOFError:
> break
> ...
>
> but i guess there must be a simpler way.
>
> using bash i simply do 'cat', *sigh*!
>
> bye
>
> max
>
> ps: in perl you ca do this:
>
> ...
> while ($line = <STDIN>)
> {
> print STDOUT ("$line");
> }
> ...[/color]

Try this.

import sys

line = sys.stdin.readl ine()
while line:
sys.stdout.writ e(line)
line = sys.stdin.readl ine()

--
I like python!
My Donews Blog: http://www.donews.net/limodou

[Dan Sommers]

Re: stdin -&gt; stdout

On Fri, 19 Aug 2005 15:26:27 GMT,
"max(01)*" <max2@fisso.cas a> wrote:
[color=blue]
> ps: in perl you ca do this:[/color]
[color=blue]
> ...
> while ($line = <STDIN>)
> {
> print STDOUT ("$line");
> }
> ...[/color]

import fileinput
import sys

for line in fileinput.input ():
sys.stdout.writ e(line)

Regards,
Dan

--
Dan Sommers
<http://www.tombstoneze ro.net/dan/>

[gry@ll.mit.edu]

Re: stdin -&gt; stdout

import sys
for l in sys.stdin:
sys.stdout.writ e(l)

-- George

[Steven Bethard]

Re: stdin -&gt; stdout

max(01)* wrote:[color=blue]
> i was wondering, what's the simplest way to echo the standard input to
> the standard output, with no modification.[/color]

import sys
for line in iter(sys.stdin. readline, ''):
sys.stdout.writ e(line)

Note that this uses the second form of iter(), which calls its first
argument repeatedly until it returns the sentinel value (its second
argument).

STeVe

[Steven Bethard]

Re: stdin -&gt; stdout

gry@ll.mit.edu wrote:[color=blue]
> import sys
> for l in sys.stdin:
> sys.stdout.writ e(l)[/color]

This is fine if you don't need the reads and writes of lines to run in
lockstep. File iterators read into a buffer, so you'll probably read
4096 bytes from stdin before you ever write a line to stdout. If that's
okay, this is a good solution. OTOH, if you want the reads and writes
to run in lockstep, you should probably use this idiom:

import sys
for line in iter(sys.stdin. readline, ''):
sys.stdout.writ e(line)

STeVe

P.S. You may also be able to get your version working using the -u
(unbuffered) option to Python, but I couldn't.

[John Machin]

Re: stdin -&gt; stdout

limodou wrote:[color=blue]
> 2005/8/19, max(01)* <max2@fisso.cas a>:
>[color=green]
>>hi.
>>
>>i was wondering, what's the simplest way to echo the standard input to
>>the standard output, with no modification.
>>
>>i came up with:
>>
>>...
>>while True:
>> try:
>> raw_input()
>> except EOFError:
>> break
>>...
>>
>>but i guess there must be a simpler way.
>>
>>using bash i simply do 'cat', *sigh*!
>>
>>bye
>>
>>max
>>
>>ps: in perl you ca do this:
>>
>>...
>>while ($line = <STDIN>)
>> {
>> print STDOUT ("$line");
>> }
>>...[/color]
>
>
> Try this.
>
> import sys
>
> line = sys.stdin.readl ine()
> while line:
> sys.stdout.writ e(line)
> line = sys.stdin.readl ine()
>[/color]

Try this:

import sys
for line in sys.stdin:
sys.stdout.writ e(line)

[Jorgen Grahn]

Re: stdin -&gt; stdout

On Fri, 19 Aug 2005 15:26:27 GMT, max(01)* <max2@fisso.cas a> wrote:[color=blue]
> hi.
>
> i was wondering, what's the simplest way to echo the standard input to
> the standard output, with no modification.
>
> i came up with:[/color]
....[color=blue]
> but i guess there must be a simpler way.
>
> using bash i simply do 'cat', *sigh*![/color]
....[color=blue]
> ps: in perl you ca do this:
>
> ...
> while ($line = <STDIN>)
> {
> print STDOUT ("$line");
> }
> ...[/color]

Actually, in perl it's easier than that, if you can tolerate that it also
filters file(s) given on the command-line:

while(<>) {
print;
}

or even:

#!/usr/bin/perl -p
;

Of course, not every programming language needs to have easy-to-use
filtering capabilities at the core.

/Jorgen

--
// Jorgen Grahn <jgrahn@ Ph'nglui mglw'nafh Cthulhu
\X/ algonet.se> R'lyeh wgah'nagl fhtagn!

[Jeff Schwab]

Re: stdin -&gt; stdout

max(01)* wrote:[color=blue]
> i was wondering, what's the simplest way to echo the standard input to
> the standard output, with no modification.[/color]
....[color=blue]
> ps: in perl you ca do this:
>
> ...
> while ($line = <STDIN>)
> {
> print STDOUT ("$line");
> }
> ...[/color]

I guess you could, but there wouldn't be much point. In Perl, you can
do this with just command-line flags:

perl -pe '' input.txt

Or if you really want something to put in a file:

print <>

Here's the closest thing I could come up with in Python:

import sys
for line in sys.stdin:
print line,