import sys

import types

# Credit to six authors: https://pypi.python.org/pypi/six

# License: MIT

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', (), {})

# Compatability definitions (inspired by six)

PY2 = sys.version_info[0] < 3

if PY2:

# disable flake8 checks on python 3

string_type = basestring # noqa

unicode_type = unicode # noqa

class_types = (type, types.ClassType)

buffer_type = buffer # noqa

else:

string_type = str

unicode_type = str

class_types = (type,)

buffer_type = memoryview