code: def diff_iter(base, other, options=None, **kwargs):
      
      if options is None:
          options = DiffOptions(**kwargs)
      elif len(kwargs):
          raise exc.DiffOptionsException()
  
      null_fs = FieldSelector(tuple())
      return _diff_iter(base, other, null_fs, null_fs, options)
docs: Compare a Record with another object (usually a record of the same
      type), and yield differences as :py:class:`DiffInfo` instances.
  
      args:
          ``base=``\ *Record*
              The 'base' object to compare against.  The enumeration in
              :py:class:`DiffTypes` is relative to this object.
  
          ``other=``\ *Record*\ \|\ *<object>*
              The 'other' object to compare against.  If ``duck_type`` is not
              true, then it must be of the same type as the ``base``.
  
          ``**kwargs``
              Specify comparison options: ``duck_type``, ``ignore_ws``, etc.  See
              :py:meth:`normalize.diff.DiffOptions.__init__` for the complete
              list.
  
          ``options=``\ *DiffOptions instance*
              Pass in a pre-constructed :py:class:`DiffOptions` instance.  This
              may not be specified along with ``**kwargs``.