code: def frame(self, frame):
          
          try:
              zframe = str(int(frame)).zfill(self._zfill)
          except ValueError:
              zframe = frame
  
          # There may have been no placeholder for frame IDs in
          # the sequence, in which case we don't want to insert
          # a frame ID
  
          if self._zfill == 0:
              zframe = ""
  
          return "".join((self._dir, self._base, zframe, self._ext))
docs: Return a path go the given frame in the sequence.  Integer or string
          digits are treated as a frame number and padding is applied, all other
          values are passed though.
  
          Examples:
              >>> seq.frame(1)
              /foo/bar.0001.exr
              >>> seq.frame("#")
              /foo/bar.#.exr
  
          Args:
              frame (int or str): the desired frame number or a char to pass
                  through (ie. #)
  
          Returns:
              str: