def __iadd__(self, other):
<EOL>assert isinstance(other, LocationDescriptor), "<STR_LIT>"<EOL>assert self._separation_char == other._separation_char,"<STR_LIT>"<EOL>self._locations_list.extend(other._locations_list)<EOL>return self<EOL>
**Extend** an existing :class:`LocationDescriptor` object by another.

Args:
    self: This :class:`LocationDescriptor` object.
    other: Another :class:`LocationDescriptor` object.

Returns:
    The updated :class:`LocationDescriptor` object itself.