import socket  import fcntl  import struct      def get_ip_address(ifname):     """      >>> get_ip_address('lo')      '127.0.0.1'          >>> get_ip_address('eth0')      '38.113.228.130'      """      s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)      return socket.inet_ntoa(fcntl.ioctl(          s.fileno(),          0x8915,  # SIOCGIFADDR          struct.pack('256s', ifname[:15])      )[20:24])