code: def _read_bands(self):
          
          bands = []
  
          try:
              for i, band in enumerate(self.bands):
                  bands.append(rasterio.open(self.bands_path[i]).read_band(1))
          except IOError as e:
              exit(e.message, 1)
  
          return bands
docs: Reads a band with rasterio