Format the output - python

Question

I have this code here

import subprocess
from time import strftime       # Load just the strftime Module from Time

f = open('check_'+strftime("%Y-%m-%d")+'.log', 'w')
for server in open('check.txt'):
    f.write(server.strip() + "\n")
    subprocess.Popen(['plink', server.strip(), 'df','-k'],stdout=f)

What I would like to have is the output so it shows:

Server Name

Output

Server Name

Output

Currently it shows:

server name

server name

output

output

Thanks in advance

Eduardo Ivanec · Accepted Answer · 2012-01-06 17:39:44Z

2

First of all - if your intention is to run different commands in remote servers, take a look at Fabric.

By default subprocess.Popen runs in the background, and your command is probably much slower than the other things in your loop (like printing the server names). Try this to force it to wait for each process:

import subprocess
from time import strftime       # Load just the strftime Module from Time

f = open('check_'+strftime("%Y-%m-%d")+'.log', 'w')
for server in open('check.txt'):
    f.write(server.strip() + "\n")
    p = subprocess.Popen(['plink', server.strip(), 'df','-k'],stdout=f)
    p.wait()
    f.flush()

If you intend to make the process run in parallel, I'd just write each server log to a different file. Then concatenate the result if needed.

answered Jan 6, 2012 at 17:39

Eduardo Ivanec

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1 Comment

geekcomputers Over a year ago

Excellent, thanks very much for that, it solved it. I changed the f.flush() and p.wait() round as it was printing the server after the output.

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