code: def _parse_ip(addr):
      
  
      # Parse the IP address
      try:
          address = netaddr.IPAddress(addr.strip())
      except (ValueError, netaddr.AddrFormatError):
          return None
  
      # Canonicalize it, if possible
      if address.version == 6:
          try:
              return address.ipv4()
          except netaddr.AddrConversionError:
              pass
  
      return address
docs: Helper function to convert an address into an IPAddress object.
      Canonicalizes IPv6-mapped (or compatible) IPv4 addresses into IPv4
      addresses.  Returns None if the address cannot be parsed.