Python split and merge the line

Question

df = subprocess.Popen(["df", options.partname], stdout=subprocess.PIPE)
output = df.communicate()[0]
print output

gives the following:

Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/sys-scratch
                     1446412616 847216452 524555652  62% /scratch

In some cases (machines),

output.split("\n")[1]

gives me

/dev/mapper/sys-scratch

where as I want

/dev/mapper/sys-scratch 1446412616 847216452 524555652  62% /scratch  # in one line

I am using the values in the output like this :

device, size, used, available, percent, mountpoint = output.split("\n")[1].split()

For some machines, this fails because output.split("\n")[1] only has a single value. How can I fix this ?

It looks like a newline is inserted to fit the longer filesystem name. — Martijn Pieters, Apr 05 '13 at 16:09
Which information do you need, exactly? `df` isn't designed for scripted parsing; there are better ways to get disk information. — John Kugelman, Apr 05 '13 at 16:10
The **other** answers in [Find size and free space of the filesystem containing a given file](http://stackoverflow.com/q/4260116) are actually better than using `df`. — Martijn Pieters, Apr 05 '13 at 16:11

score 0 · Accepted Answer · answered Apr 05 '13 at 16:13

In this specific case, you can re-join the last 2 lines:

df = subprocess.Popen(["df", options.partname], stdout=subprocess.PIPE)
output = df.communicate()[0]
output = ' '.join(output.splitlines()[1:])
device, size, used, available, percent, mountpoint = output.split()

Python split and merge the line

1 Answers1