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RE: subprocess.call

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  RE: subprocess.call Ombongi Moraa Fe <moraa.lovetakes2@gmail.com> - 2013-04-19 12:56 +0300
    Re: subprocess.call Mau C <nobody@hotmail.com> - 2013-04-19 12:32 +0200
    Re: subprocess.call jt@toerring.de (Jens Thoms Toerring) - 2013-04-19 14:43 +0000

#43893 — RE: subprocess.call

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Hi Team,

In my python script, I have this:

command="lynx -dump
'phpscript?param1=%s&param2=%s&param3=%s&param4=%s&param5=%s'"%(value1,value2,value3,value4)

result=subprocess.call(command,shell=True)
print 'xml message'

However, the response from running the php script is also printed on output
screen. I don't want this output.

How can i ensure that only the last print 'xml response' is returned?

Saludos

Ombongi Moraa Faith

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#43894

Il 19/04/2013 11:56, Ombongi Moraa Fe ha scritto:
> Hi Team,
> 
> In my python script, I have this:
> 
> command="lynx -dump
> 'phpscript?param1=%s&param2=%s&param3=%s&param4=%s&param5=%s'"%(value1,value2,value3,value4)

http://docs.python.org/2/library/subprocess.html#module-subprocess

You should set the properly values for stdou and stderr.
Under UNIX, '/dev/null' worked out fine for me, when 'None' didn't.



M.

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#43902

Ombongi Moraa Fe <moraa.lovetakes2@gmail.com> wrote:
> [-- text/plain, encoding 7bit, charset: ISO-8859-1, 19 lines --]

> In my python script, I have this:

> command="lynx -dump
> 'phpscript?param1=%s&param2=%s&param3=%s&param4=%s&param5=%s'"%(value1,value2,value3,value4)

> result=subprocess.call(command,shell=True)
> print 'xml message'

> However, the response from running the php script is also printed on output
> screen. I don't want this output.

> How can i ensure that only the last print 'xml response' is returned?

You mean is printed out? Use subprocess.Popen() and redirect
stdout to a pipe, similar to this:

 p = subprocess.Popen(command, stdout=subprocess.PIPE)
 r = p.communicate()
 print r[0]   # This is the output (to stdout)

The return value of the Popen objects communicate() method is
a tuple with two elements, first contains what got written to
stdout (if redirected to a pipe, otherwise Nome), the second
what went to stderr (again if redirected to a pipe). If you
also redirect stdin then you can pass what you want to send
to the process spawned via Popen() as an argument to commu-
nicate().

BTW, according to the dicumentation you should split the
command line into its componenents and pass that as a list
to the call() or Popen() subprocess methods, so it would
seem to reasonable to use e.g.

 command = [ 'lynx', '-dump',
             ( "'phpscript?param1={0}&param2={1}&param3={2}"
			   "&param4={3}&param5={4}'" )
             .format( value1, value2, value3, value4, value5 ) ]


Note that there was one value for creating the string to be
passed to lynx was mising.
                               Regards, Jens
-- 
  \   Jens Thoms Toerring  ___      jt@toerring.de
   \__________________________      http://toerring.de

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