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"""
For Python < 2.7.2. total_ordering in versions prior to 2.7.2 is buggy.
See http://bugs.python.org/issue10042 for details. For these versions use
code borrowed from Python 2.7.3.

From django.utils.
"""

import sys
if sys.version_info >= (2, 7, 2):
    from functools import total_ordering
else:
    def total_ordering(cls):
        """Class decorator that fills in missing ordering
methods"""
        convert = {
            '__lt__': [('__gt__', lambda self, other:
not (self < other or self == other)),
                       ('__le__', lambda self, other: self <
other or self == other),
                       ('__ge__', lambda self, other: not self
< other)],
            '__le__': [('__ge__', lambda self, other:
not self <= other or self == other),
                       ('__lt__', lambda self, other: self <=
other and not self == other),
                       ('__gt__', lambda self, other: not self
<= other)],
            '__gt__': [('__lt__', lambda self, other:
not (self > other or self == other)),
                       ('__ge__', lambda self, other: self >
other or self == other),
                       ('__le__', lambda self, other: not self
> other)],
            '__ge__': [('__le__', lambda self, other:
(not self >= other) or self == other),
                       ('__gt__', lambda self, other: self >=
other and not self == other),
                       ('__lt__', lambda self, other: not self
>= other)]
        }
        roots = set(dir(cls)) & set(convert)
        if not roots:
            raise ValueError('must define at least one ordering
operation: < > <= >=')
        root = max(roots)       # prefer __lt__ to __le__ to __gt__ to
__ge__
        for opname, opfunc in convert[root]:
            if opname not in roots:
                opfunc.__name__ = opname
                opfunc.__doc__ = getattr(int, opname).__doc__
                setattr(cls, opname, opfunc)
        return cls