Lichen

lib/__builtins__/boolean.py

932:c07b0dd14f85
10 months ago Paul Boddie Moved integer instantiation support to library functions.
     1 #!/usr/bin/env python     2      3 """     4 Boolean 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 class boolean:    23     24     "The type of the True and False objects."    25     26     def __bool__(self):    27     28         "Identity operation."    29     30         return self    31     32     def __str__(self):    33     34         "Return a string representation."    35     36         return self is True and "True" or "False"    37     38     __repr__ = __str__    39     40 False = boolean()    41 True = boolean()    42     43 def bool(obj):    44     45     "Evaluate 'obj' as a boolean value."    46     47     return obj.__bool__()    48     49 # vim: tabstop=4 expandtab shiftwidth=4