import telnetlib
import time
import getpass
import sys
import threading
old_stdout = sys.stdout
new_stdout = open('Processes_CPU.txt', '+a')

COMMAND = b'sh processes cpu sorted 5sec'
USER = input('Username: ').encode('utf-8')
PASSWORD = getpass.getpass().encode('utf-8')

IP = '192.168.1.100'

print('Connection to device {}'.format(IP))
t = telnetlib.Telnet(IP)

t.read_until(b'Username:')
t.write(USER + b'\n')

t.read_until(b'Password:')
t.write(PASSWORD + b'\n')

t.write(b'terminal length 8\n')

def Quiz():
    sys.stdout = new_stdout
    t.write(b'\n' + COMMAND + b'\n')
    output = t.read_very_eager().decode('utf-8')
    print(output)
    sys.stdout = old_stdout
    print('...')

def someHandler():
    exit_flag = threading.Event()
    while not exit_flag.wait(timeout=4):
        Quiz()

someHandler()