1 #!/usr/bin/env python 2 3 """ 4 Tuple objects. 5 6 Copyright (C) 2015, 2016 Paul Boddie <paul@boddie.org.uk> 7 8 This program is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free Software 10 Foundation; either version 3 of the License, or (at your option) any later 11 version. 12 13 This program is distributed in the hope that it will be useful, but WITHOUT 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 15 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 16 details. 17 18 You should have received a copy of the GNU General Public License along with 19 this program. If not, see <http://www.gnu.org/licenses/>. 20 """ 21 22 from __builtins__.iterator import listiterator 23 from __builtins__.sequence import _getitem, _getslice, _tuple 24 25 class tuple(object): 26 27 "Implementation of tuple." 28 29 def __init__(self, args): pass 30 31 def __getitem__(self, index): 32 33 "Return the item or slice specified by 'index'." 34 35 return _getitem(self, index) 36 37 def __getslice__(self, start, end=None): 38 39 "Return a slice starting from 'start', with the optional 'end'." 40 41 return _tuple(_getslice(self, start, end)) 42 43 def __len__(self): pass 44 def __add__(self, other): pass 45 def __str__(self): pass 46 47 def __bool__(self): 48 49 "Tuples are true if non-empty." 50 51 return self.__len__() != 0 52 53 def __iter__(self): 54 55 "Return an iterator." 56 57 return listiterator(self) 58 59 # Special implementation methods. 60 61 def __get_single_item__(self, index): pass 62 63 # vim: tabstop=4 expandtab shiftwidth=4