Restricted a workaround for a bug in Python to the affected versions.

from functools import wraps, update_wrapper, WRAPPER_ASSIGNMENTS

from django.utils import six

class classonlymethod(classmethod):

    def __get__(self, instance, owner):

        if instance is not None:

            raise AttributeError("This method is available only on the view class.")

        return super(classonlymethod, self).__get__(instance, owner)

def method_decorator(decorator):

    """

    Converts a function decorator into a method decorator

def available_attrs(fn):

    """

    Return the list of functools-wrappable attributes on a callable.

    This is required as a workaround for http://bugs.python.org/issue3445.

    This is required as a workaround for http://bugs.python.org/issue3445

    under Python 2.

    """

    if six.PY3:

        return WRAPPER_ASSIGNMENTS

    else:

        return tuple(a for a in WRAPPER_ASSIGNMENTS if hasattr(fn, a))