En Fri, 06 Aug 2010 06:06:29 -0300, loial <[email protected]> escribió:
I need to read a large amount of data that is being returned in
standard output by a shell script I am calling.
(I think the script should really be writing to a file but I have no
control over that)
Currently I have the following code. It seeems to work, however I
suspect this may not work with large amounts of standard output.
What is the best way to read a large amount of data from standard
output and write to a file?
Here is my code.
process=subprocess.Popen(['myscript', 'param1'],
shell=False,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
cmdoutput=process.communicate()
myfile = open('/home/john/myoutputfile','w')
myfile.write(cmdoutput[0])
myfile.close()
If all you do with the process' output is to write it to the output file,
you can avoid the intermediate step:
myfile = open('/home/john/myoutputfile','w')
myerror = open('/home/john/myerrorfile','w')
process=subprocess.Popen(['myscript', 'param1'],
shell=False,stdout=myfile,stderr=myerror)
process.wait()
(untested)
--
Gabriel Genellina
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