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compat.py
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compat.py
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# vim:ts=4:sw=4:sts=4:et
# -*- coding: utf-8 -*-
"""
Compatibility methods and backported versions of newer Python features
to enable igraph to run on Python 2.5.
"""
import sys
__license__ = u"""\
Copyright (C) 2006-2012 Tamás Nepusz <ntamas@gmail.com>
Pázmány Péter sétány 1/a, 1117 Budapest, Hungary
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
"""
#############################################################################
# Simulating math.isnan
try:
from math import isnan
except ImportError:
def isnan(num):
return num != num
#############################################################################
# Providing @property.setter syntax for Python 2.5
if sys.version_info < (2, 6):
_property = property
class property(property):
def __init__(self, fget, *args, **kwds):
self.__doc__ = fget.__doc__
super(property, self).__init__(fget, *args, **kwds)
def setter(self, fset):
cls_ns = sys._getframe(1).f_locals
for k, v in cls_ns.iteritems():
if v == self:
propname = k
break
cls_ns[propname] = property(self.fget, fset, self.fdel, self.__doc__)
return cls_ns[propname]
else:
property = __builtins__["property"]
#############################################################################
# Providing BytesIO for Python 2.5
try:
from io import BytesIO
except ImportError:
# We are on Python 2.5 or earlier because Python 2.6 has a BytesIO
# class already
from cStringIO import StringIO
BytesIO = StringIO