code: def classify_host(host):
      '''Host is an IPv4Address, IPv6Address or a string.
  
      If an IPv4Address or IPv6Address return it.  Otherwise convert the string to an
      IPv4Address or IPv6Address object if possible and return it.  Otherwise return the
      original string if it is a valid hostname.
  
      Raise ValueError if a string cannot be interpreted as an IP address and it is not
      a valid hostname.
      '''
      if isinstance(host, (IPv4Address, IPv6Address)):
          return host
      if is_valid_hostname(host):
          return host
      return ip_address(hostf classify_host(host):
      '''Host is an IPv4Address, IPv6Address or a string.
  
      If an IPv4Address or IPv6Address return it.  Otherwise convert the string to an
      IPv4Address or IPv6Address object if possible and return it.  Otherwise return the
      original string if it is a valid hostname.
  
      Raise ValueError if a string cannot be interpreted as an IP address and it is not
      a valid hostname.
      '''
      if isinstance(host, (IPv4Address, IPv6Address)):
          return host
      if is_valid_hostname(host):
          return host
      return ip_address(host)
docs: Host is an IPv4Address, IPv6Address or a string.
  
      If an IPv4Address or IPv6Address return it.  Otherwise convert the string to an
      IPv4Address or IPv6Address object if possible and return it.  Otherwise return the
      original string if it is a valid hostname.
  
      Raise ValueError if a string cannot be interpreted as an IP address and it is not
      a valid hostname.