docs: def __ReadFromDirectory(self, datapath, dicom_expected=None):
          """This function is actually the ONE, which reads 3D data from file
  
          :param datapath: path to file
          :return: tuple (data3d, metadata)
          """
          start = self.start
          stop = self.stop
          step = self.step
          kwargs = self.kwargs
          gui = self.gui
  
          if (dicom_expected is not False) and (dcmr.is_dicom_dir(datapath)):  # reading dicom
              logger.debug('Dir - DICOM')
              logger.debug("dicom_expected " + str(dicom_expected))
              reader = dcmr.DicomReader(datapath,
                                        series_number=self.series_number,
                                        gui=gui,
                                        **kwargs)  # qt_app=None, gui=True)
              data3d = reader.get_3Ddata(start, stop, step)
              metadata = reader.get_metaData()
              metadata['series_number'] = reader.series_number
              metadata['datadir'] = datapath
              self.overlay_fcn = reader.get_overlay
          else:  # reading image sequence
              logger.debug('Dir - Image sequence')
  
              logger.debug('Getting list of readable files...')
              flist = []
              try:
                  import SimpleITK as Sitk
              except ImportError as e:
                  logger.error("Unable to import SimpleITK. On Windows try version 1.0.1")
              for f in os.listdir(datapath):
                  try:
                      Sitk.ReadImage(os.path.join(datapath, f))
                  except Exception as e:
                      logger.warning("Cant load file: " + str(f))
                      logger.warning(e)
                      continue
                  flist.append(os.path.join(datapath, f))
              flist.sort()
  
              logger.debug('Reading image data...')
              image = Sitk.ReadImage(flist)
              logger.debug('Getting numpy array from image data...')
              data3d = Sitk.GetArrayFromImage(image)
              metadata = _metadata(image, datapath)
          return data3d, metadata