code: def serialize_bytes(data):
          
          if not isinstance(data, bytes):
              if isinstance(data, str):
                  data = data.encode('utf-8')
              else:
                  raise TypeError(
                      'bytes or str expected, not {}'.format(type(data)))
  
          r = []
          if len(data) < 254:
              padding = (len(data) + 1) % 4
              if padding != 0:
                  padding = 4 - padding
  
              r.append(bytes([len(data)]))
              r.append(data)
  
          else:
              padding = len(data) % 4
              if padding != 0:
                  padding = 4 - padding
  
              r.append(bytes([
                  254,
                  len(data) % 256,
                  (len(data) >> 8) % 256,
                  (len(data) >> 16) % 256
              ]))
              r.append(data)
  
          r.append(bytes(padding))
          return b''.join(r)
docs: Write bytes by using Telegram guidelines