def _get_release_date_from(xblock):
 return _xblock_type_and_display_name(find_release_date_source(xblock))

def _get_release_date_from ( xblock ) : return _xblock_type_and_display_name ( find_release_date_source ( xblock ) )
returns a string representation of the section or subsection that sets the xblocks release date .