1 #!/usr/bin/env python 2 3 """ 4 Attribute-related functions. 5 6 Copyright (C) 2015 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 _getattr_default=object() # a unique placeholder for a missing value 23 24 def getattr(obj, name, default=_getattr_default): 25 26 "Implementation of getattr." 27 28 try: 29 return _getattr(obj, name) 30 except AttributeError: 31 if default is not _getattr_default: 32 return default 33 else: 34 raise 35 36 def hasattr(obj, name): pass 37 def setattr(obj, name, value): pass 38 def _getattr(obj, name): pass 39 40 # vim: tabstop=4 expandtab shiftwidth=4
