Reading stdout and stderr of an external program

[Murali]

Hi Python programmers,

I need to be able to read the stdout and stderr streams of an external
program that I launch from my python script. os.system( 'my_prog' +
'>& err.log' ) and was planning on monitoring err.log and to display
its contents. Is this the best way to do this?

Thanks,
Murali.

 

[Ben Cartwright]

I need to be able to read the stdout and stderr streams of an external

program that I launch from my python script. os.system( 'my_prog' +
'>& err.log' ) and was planning on monitoring err.log and to display
its contents. Is this the best way to do this?

from subprocess import Popen
stdout, stderr = Popen('my_prog').communicate()

--Ben

 

[Thomas Jollans]

Hi Python programmers,

I need to be able to read the stdout and stderr streams of an external
program that I launch from my python script. os.system( 'my_prog' +
'>& err.log' ) and was planning on monitoring err.log and to display
its contents. Is this the best way to do this?

No. The best way to do this is with Popen, as it is portable and avoids the
extranous file.