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#!/usr/bin/python # -*- coding: utf-8 -*- # # Urwid python compatibility definitions # Copyright (C) 2011 Ian Ward # # This library is free software; you can redistribute it and/or # modify it under the terms of the GNU Lesser General Public # License as published by the Free Software Foundation; either # version 2.1 of the License, or (at your option) any later version. # # This library is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # Lesser General Public License for more details. # # You should have received a copy of the GNU Lesser General Public # License along with this library; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA # # Urwid web site: http://excess.org/urwid/ from __future__ import division, print_function import sys try: # python 2.4 and 2.5 compat bytes = bytes except NameError: bytes = str PYTHON3 = sys.version_info > (3, 0) # for iterating over byte strings: # ord2 calls ord in python2 only # chr2 converts an ordinal value to a length-1 byte string # B returns a byte string in all supported python versions # bytes3 creates a byte string from a list of ordinal values if PYTHON3: ord2 = lambda x: x chr2 = lambda x: bytes([x]) B = lambda x: x.encode('iso8859-1') bytes3 = bytes text_type = str xrange = range text_types = (str,) def reraise(tp, value, tb=None): """ Reraise an exception. Taken from "six" library (https://pythonhosted.org/six/). """ try: if value is None: value = tp() if value.__traceback__ is not tb: raise value.with_traceback(tb) raise value finally: value = None tb = None else: ord2 = ord chr2 = chr B = lambda x: x bytes3 = lambda x: bytes().join([chr(c) for c in x]) text_type = unicode xrange = xrange text_types = (str, unicode) """ Reraise an exception. Taken from "six" library (https://pythonhosted.org/six/). """ def exec_(_code_, _globs_=None, _locs_=None): """Execute code in a namespace.""" if _globs_ is None: frame = sys._getframe(1) _globs_ = frame.f_globals if _locs_ is None: _locs_ = frame.f_locals del frame elif _locs_ is None: _locs_ = _globs_ exec("""exec _code_ in _globs_, _locs_""") exec_("""def reraise(tp, value, tb=None): try: raise tp, value, tb finally: tb = None """) def with_metaclass(meta, *bases): """ Create a base class with a metaclass. Taken from "six" library (https://pythonhosted.org/six/). """ # This requires a bit of explanation: the basic idea is to make a dummy # metaclass for one level of class instantiation that replaces itself with # the actual metaclass. class metaclass(type): def __new__(cls, name, this_bases, d): return meta(name, bases, d) @classmethod def __prepare__(cls, name, this_bases): return meta.__prepare__(name, bases) return type.__new__(metaclass, 'temporary_class', (), {})
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