RuntimeError: maximum recursion depth exceeded while calling a Python object

Django 프로젝트, 앱 생성시 아래와 같은 에러가 발생할 경우

File "C:\Python27\Lib\functools.py", line 56, in <lambda>

    '__lt__': [('__gt__', lambda self, other: other < self),

RuntimeError: maximum recursion depth exceeded while calling a Python object

C:\Python27\Lib\functools.py 에 Convert 부분을 다음과 같이 변경해 주면 된다.

def total_ordering(cls):
    """Class decorator that fills in missing ordering methods"""
    # convert = {
    #     '__lt__': [('__gt__', lambda self, other: other < self),
    #                ('__le__', lambda self, other: not other < self),
    #                ('__ge__', lambda self, other: not self < other)],
    #     '__le__': [('__ge__', lambda self, other: other <= self),
    #                ('__lt__', lambda self, other: not other <= self),
    #                ('__gt__', lambda self, other: not self <= other)],
    #     '__gt__': [('__lt__', lambda self, other: other > self),
    #                ('__ge__', lambda self, other: not other > self),
    #                ('__le__', lambda self, other: not self > other)],
    #     '__ge__': [('__le__', lambda self, other: other >= self),
    #                ('__gt__', lambda self, other: not other >= self),
    #                ('__lt__', lambda self, other: not self >= other)]
    # }
    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)]

    }