(self,fmt,*args)
Pack data at end of data according to fmt (from struct) & increment
            offset
Pack data at end of data according to fmt (from struct) & increment
            offset
Pack data at end of data according to fmt ( from struct ) & increment offset
def pack(self,fmt,*args):
        """
            Pack data at end of data according to fmt (from struct) & increment
            offset
        """
        self.offset += struct.calcsize(fmt)
        self.data += struct.pack(fmt,*args)
def pack ( self , fmt , * args ) : self . offset += struct . calcsize ( fmt ) self . data += struct . pack ( fmt , * args )