CODEWITHSUNDEEP
pythonpython-2.7
Gabriel
Gabriel

Reputation: 130

How can I remove \n and \r\n from stdout in python?

I have this script:

#!/usr/bin/python

import subprocess
import sys

HOST="cacamaca.caca"
COMMAND="display mac-address 0123-4567-8910"

ssh = subprocess.Popen(["ssh", "%s" % HOST, COMMAND],
                       shell=False,
                       stdout=subprocess.PIPE,
                       stderr=subprocess.PIPE)
result = ssh.stdout.readlines()
if result == []:
    error = ssh.stderr.readlines()
    print >>sys.stderr, "ERROR: %s" % error
else:
    print result

Because the output has spaces and different lines, it prints carriage returns and new lines too so the result isn't a clean one:

['\r\n', 'cacamaca.caca\r\n', 'Info: The max number of VTY users is 10, and the number\r\n', ' of current VTY users on line is 2.\r\n', ' The current login time is 2017-07-20 20:10:54+03:00 DST.\r\n', '-------------------------------------------------------------------------------\r\n', 'MAC Address VLAN/VSI Learned-From Type \r\n', '-------------------------------------------------------------------------------\r\n', '0123-4567-8910 1234/- Eth-Trunk9 dynamic \r\n', '\r\n', '-------------------------------------------------------------------------------\r\n', 'Total items displayed = 1 \n', '\r\n', '']

How can I remove '\n' and '\r\n' or at least replace them with spaces so that the result looks like the original one? I did read a lot of answers about this, but none helped.

Upvotes: 4

Views: 9763

Answers (3)

user7548672
user7548672

Reputation:

You can remove '\n' and '\r\n' by using the following code. 

with subprocess.Popen(["ssh", "%s" % HOST, COMMAND], shell=False) as ssh:
        result = ssh.communicate()[0]
        print(result)

Upvotes: -1

Mohd
Mohd

Reputation: 5613

You can use .strip() to remove new line characters, or .replace() to replace them, for example:

result = [x.strip() for x in result]

output:

['', 'cacamaca.caca', 'Info: The max number of VTY users is 10, and the number', 'of current VTY users on line is 2.', 'The current login time is 2017-07-20 20:10:54+03:00 DST.', '-------------------------------------------------------------------------------', 'MAC Address VLAN/VSI Learned-From Type', '-------------------------------------------------------------------------------', '0123-4567-8910 1234/- Eth-Trunk9 dynamic', '', '-------------------------------------------------------------------------------', 'Total items displayed = 1', '', '']

Upvotes: 2

wpercy
wpercy

Reputation: 10090

Your result variable is a list. I think you want to join the results into a single string and print that. You can do that with str.join() like this

print ''.join(result)

This will result in the following output 

cacamaca.caca
Info: The max number of VTY users is 10, and the number
 of current VTY users on line is 2.
 The current login time is 2017-07-20 20:10:54+03:00 DST.
-------------------------------------------------------------------------------
MAC Address VLAN/VSI Learned-From Type
-------------------------------------------------------------------------------
0123-4567-8910 1234/- Eth-Trunk9 dynamic

-------------------------------------------------------------------------------
Total items displayed = 1

Upvotes: 6

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