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 sequence 24 import native 25 26 class tuple(sequence): 27 28 "Implementation of tuple." 29 30 def __init__(self, args=None): 31 32 "Initialise the tuple." 33 34 self.__data__ = native._tuple_init(args, len(args)) # allocate and copy elements 35 36 def __getslice__(self, start, end=None): 37 38 "Return a slice starting from 'start', with the optional 'end'." 39 40 return native._list_to_tuple(get_using(sequence.__getslice__, self)(start, end)) 41 42 def __len__(self): 43 44 "Return the length of the tuple." 45 46 return native._tuple_len(self) 47 48 def __add__(self, other): pass 49 50 def __str__(self): pass 51 52 __repr__ = __str__ 53 54 def __bool__(self): 55 56 "Tuples are true if non-empty." 57 58 return self.__len__() != 0 59 60 def __iter__(self): 61 62 "Return an iterator." 63 64 return listiterator(self) 65 66 # Special implementation methods. 67 68 def __get_single_item__(self, index): 69 return native._tuple_element(self, index) 70 71 # vim: tabstop=4 expandtab shiftwidth=4