How to use the tifffile.tifffile.lazyattr function in tifffile

    @lazyattr
    def shape(self):
        shape = tuple(dim.size for dim in self.dimension_entries
                      if dim.dimension != b'M')
        sampleshape = numpy.dtype(self.dtype).shape
        return shape + (sampleshape if sampleshape else (1,))

    @lazyattr
    def dtype(self):
        """Return dtype of image data in file."""
        # subblock data can be of different pixel type
        dtype = self.filtered_subblock_directory[0].dtype[-2:]
        for directory_entry in self.filtered_subblock_directory:
            dtype = numpy.promote_types(dtype, directory_entry.dtype[-2:])
        return dtype

    @lazyattr
    def stored_shape(self):
        shape = tuple(dim.stored_size for dim in self.dimension_entries
                      if dim.dimension != b'M')
        sampleshape = numpy.dtype(self.dtype).shape
        return shape + (sampleshape if sampleshape else (1,))

    @lazyattr
    def metadata(self):
        """Return data from MetadataSegment as xml.ElementTree root Element.

        Return None if no Metadata segment is found.

        """
        if self.header.metadata_position:
            segment = Segment(self._fh, self.header.metadata_position)
            if segment.sid == MetadataSegment.SID:
                data = segment.data().data()
                return etree.fromstring(data.encode('utf-8'))
        warnings.warn("Metadata segment not found")
        try:
            metadata = next(self.segments(MetadataSegment.SID))
            return etree.fromstring(metadata.data().encode('utf-8'))
        except StopIteration:

    @lazyattr
    def filtered_subblock_directory(self):
        """Return sorted list of DirectoryEntryDV if mosaic, else all."""
        if not self._filter_mosaic:
            return self.subblock_directory
        filtered = [directory_entry
                    for directory_entry in self.subblock_directory
                    if directory_entry.mosaic_index is not None]
        if not filtered:
            return self.subblock_directory
        return list(sorted(filtered, key=lambda x: x.mosaic_index))

    @lazyattr
    def start(self):
        start = tuple(dim.start for dim in self.dimension_entries
                      if dim.dimension != b'M')
        return start + (0,)

    @lazyattr
    def metadata(self):
        """Return data from MetadataSegment as xml.ElementTree root Element.

        Return None if no Metadata segment is found.

        """
        if self.header.metadata_position:
            segment = Segment(self._fh, self.header.metadata_position)
            if segment.sid == MetadataSegment.SID:
                data = segment.data().data()
                return etree.fromstring(data.encode('utf-8'))
        warnings.warn("Metadata segment not found")
        try:
            metadata = next(self.segments(MetadataSegment.SID))
            return etree.fromstring(metadata.data().encode('utf-8'))
        except StopIteration:

    @lazyattr
    def attachment_directory(self):
        """Return list of all AttachmentEntryA1 in file.

        Use AttachmentDirectorySegment if exists, else find AttachmentSegments.

        """
        if self.header.attachment_directory_position:
            segment = Segment(self._fh,
                              self.header.attachment_directory_position)
            if segment.sid == AttachmentDirectorySegment.SID:
                return segment.data().entries
        warnings.warn("AttachmentDirectory segment not found")
        return list(segment.attachment_entry for segment in
                    self.segments(AttachmentSegment.SID))

    @lazyattr
    def subblock_directory(self):
        """Return list of all DirectoryEntryDV in file.

        Use SubBlockDirectorySegment if exists, else find SubBlockSegments.

        """
        if self.header.directory_position:
            segment = Segment(self._fh, self.header.directory_position)
            if segment.sid == SubBlockDirectorySegment.SID:
                return segment.data().entries
        warnings.warn("SubBlockDirectory segment not found")
        return list(segment.directory_entry for segment in
                    self.segments(SubBlockSegment.SID))

    @lazyattr
    def attachment_directory(self):
        """Return list of all AttachmentEntryA1 in file.

        Use AttachmentDirectorySegment if exists, else find AttachmentSegments.

        """
        if self.header.attachment_directory_position:
            segment = Segment(self._fh,
                              self.header.attachment_directory_position)
            if segment.sid == AttachmentDirectorySegment.SID:
                return segment.data().entries
        warnings.warn("AttachmentDirectory segment not found")
        return list(segment.attachment_entry for segment in
                    self.segments(AttachmentSegment.SID))