def get_crumbs(self):
crumbs = []<EOL>for cls in reversed(type(self).__mro__[<NUM_LIT:1>:]):<EOL><INDENT>crumbs.extend(getattr(cls, '<STR_LIT>', ()))<EOL><DEDENT>crumbs.extend(list(self.crumbs))<EOL>return tuple(crumbs)<EOL>
Get crumbs for navigation links.

Returns:
    tuple:
        concatenated list of crumbs using these crumbs and the
        crumbs of the parent classes through ``__mro__``.