from subprocess import Popen, CREATE_NEW_CONSOLE,PIPE,STDOUT
import time
import subprocess
import datetime
import os
#import envSI

class Wiresharking:

        """Wireshark Server subclass"""

        def __init__(self,**kwargs):

                self.filters=''
                self.window_ip = kwargs.get('ip')
                print type(self.window_ip)
                self.window_user= kwargs.get('username')
                self.window_password= kwargs.get('password')
                self.dest_path= kwargs.get('Target_path')
                self.interface= kwargs.get('interface')
                self.terminal='cmd'
                self.home=kwargs.get('Home_path')


        def test(self):
            print 'hi'
            return self.window_ip

SERVER_01 = Wiresharking(
        name='WIRESHARK_ENV91',
        ip='192.168.1.16',
        username=r'NSN-INTRArechandr',   #always prepend r , before giving your username and password
        password='jan@2018',
        prompt='$ ',
        autostart=False,
        unzip_capture=True,
        filter='',
        #interface=['ens2f0'],
        interface='Ethernet',
        Target_path=r'D:Userspankaj-mDesktopTest'
        )

print SERVER_01.test()

<type 'str'>
hi
192.168.1.16

pybot -V env.py Check.robot

*** Settings ***
Library    Wiresharking.py
*** Test Cases ***
Test
    check
*** Keywords ***
check
    ${abc} =    test
    log    ${abc}

16:13:37.279 INFO None