old_contents: #!/usr/bin/env python
  #
  # igcollect - Memcached
  #
  # Copyright (c) 2016, InnoGames GmbH
  #
  
  import telnetlib
  import sys
  import socket
  import time
  
  
  def main(host='127.0.0.1', port='11211'):
      hostname = socket.gethostname().replace('.', '_')
      ts = str(int(time.time()))
      template = 'servers.' + hostname + '.software.memcached.{1} {2} ' + ts
  
      for line in command(host, port, 'stats').splitlines():
          if line.startswith('STAT '):
              header, key, value = line.split()
              if key.replace('_', '').isalpha() and is_float(value):
                  print(template.format(hostname, key, value))
  
  
  def command(host,  port, cmd):
      """Write a command to telnet and return the response"""
      client = telnetlib.Telnet(host, port)
      client.write(cmd + '\n')
      return client.read_until('END')
  
  
  def is_float(value):
      try:
          float(value)
      except ValueError:
          return False
      else:
          return True
  
  
  if __name__ == '__main__':
      main(*sys.argv[1:])
  
new_contents: #!/usr/bin/env python
  #
  # igcollect - Memcached
  #
  # Copyright (c) 2016, InnoGames GmbH
  #
  
  import telnetlib
  import sys
  import socket
  import time
  import re
  
  
  def main(host='127.0.0.1', port='11211'):
      hostname = socket.gethostname().replace('.', '_')
      ts = str(int(time.time()))
      template = 'servers.' + hostname + '.software.memcached.{1} {2} ' + ts
      pattern = re.compile('STAT \w+ \d+(.\d+)?$')
  
      for line in command(host, port, 'stats').splitlines():
          if pattern.match(line):
              header, key, value = line.split()
              print(template.format(hostname, key, value))
  
  
  def command(host,  port, cmd):
      """Write a command to telnet and return the response"""
      client = telnetlib.Telnet(host, port)
      client.write(cmd + '\n')
      return client.read_until('END')
  
  
  def is_float(value):
      try:
          float(value)
      except ValueError:
          return False
      else:
          return True
  
  
  if __name__ == '__main__':
      main(*sys.argv[1:])
  
subject: Use regexp for checking the line