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'''Library to make differences between Python 2 and 3 transparent'''

import sys

__all__ = [

'StringIO',

'basestring',

]

try:

from cStringIO import StringIO

except ImportError: # pragma: no cover

try:

from StringIO import StringIO

except ImportError:

from io import StringIO

PY3 = sys.version_info[0] == 3

if PY3: # pragma: no cover

basestring = str

else: # pragma: no cover

import __builtin__

basestring = __builtin__.basestring

# Copied from the public six library: -----------------------------------------

# Copyright (c) 2010-2015 Benjamin Peterson

#

# Permission is hereby granted, free of charge, to any person obtaining a copy

# of this software and associated documentation files (the "Software"), to deal

# in the Software without restriction, including without limitation the rights

# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

# copies of the Software, and to permit persons to whom the Software is

# furnished to do so, subject to the following conditions:

#

# The above copyright notice and this permission notice shall be included in

# all copies or substantial portions of the Software.

#

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

# SOFTWARE.

def with_metaclass(meta, *bases):

"""Create a base class with a metaclass."""

# 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(meta):

def __new__(cls, name, this_bases, d):

return meta(name, bases, d)

return type.__new__(metaclass, 'temporary_class', (), {})