code: def Deserialize(self, reader):
          
          self.Magic = reader.ReadUInt32()
          self.Command = reader.ReadFixedString(12).decode('utf-8')
          self.Length = reader.ReadUInt32()
  
          if self.Length > self.PayloadMaxSizeInt:
              raise Exception("invalid format- payload too large")
  
          self.Checksum = reader.ReadUInt32()
          self.Payload = reader.ReadBytes(self.Length)
  
          checksum = Message.GetChecksum(self.Payload)
  
          if checksum != self.Checksum:
              raise ChecksumException("checksum mismatch")
docs: Deserialize full object.
  
          Args:
              reader (neo.IO.BinaryReader):