How to extract characters from strings

Question

I run the code:

from subprocess import Popen, PIPE

p1 = Popen(['ip', 'addr'], stdout=PIPE)
p2 = Popen(['grep', 'enp'], stdin=p1.stdout, stdout=PIPE)
p1.stdout.close()
output=p2.communicate()[0]
print(output)

and I get the output:

b'7: enp0s20f0u1c4i2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 1000\n    inet 172.20.10.2/28 brd 172.20.10.15 scope global dynamic enp0s20f0u1c4i2\n'

How to extract the characters enp0s20f0u1c4i2 from the string of this output?

output.split(':')[1].strip()

Stephen Rauch
– Stephen Rauch ♦

2018-01-03 06:10:15 +00:00
Commented Jan 3, 2018 at 6:10 — Stephen Rauch
– Stephen Rauch ♦, Commented Jan 3, 2018 at 6:10
output.split()[-1].strip()

pylang
– pylang

2018-01-03 06:10:37 +00:00
Commented Jan 3, 2018 at 6:10 — pylang
– pylang, Commented Jan 3, 2018 at 6:10

excalibur1491 · Accepted Answer · 2018-01-03 06:13:53Z

1

If you are sure that the string output always has that same format, you could use the split function to split in :, take the first element and then clean the string to remove the spaces and \n. Similarly you could split by space and get the last element of the split (it seems the string you are looking for appears twice?)

So output.split(':')[1].strip() or output.split(' ')[-1].strip().

answered Jan 3, 2018 at 6:13

excalibur1491

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