How to get unique shift in attendance in py?

Frappe Framework App Development
1

how to get unique shift in attendance in py ?

Attendance_shift = frappe.db.get_list('Attendance', 
                                                    fields=['shift'], 
                                                    filters=[
                                                        ['docstatus','=','1'],
                                                        ['attendance_date', 'between', [filters['start_date'], filters['end_date']]],
                                                        ['shift','=',filters['shift_type']]
                                                        ])