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class TimeRange(datetime):
    def __init__(self, year, month, day,
            hour=0, minute=0, second=0, microsecond=0, tzinfo=None,
            left=0, right=0):
        datetime.__init__(self, year, month, day,
            hour, minute, second, microsecond, tzinfo)
        self.left = self - timedelta(seconds=left*60)
        self.right = self + timedelta(seconds=right*60)

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>>> tr = TimeRange(2011,8,16)
duration.py:6: DeprecationWarning: object.__init__() takes no parameters
  hour, minute, second, microsecond, tzinfo)
>>> tr
TimeRange(2011, 8, 16, 0, 0)
>>> tr = TimeRange(2011,8,16,12,15)
>>> tr
TimeRange(2011, 8, 16, 12, 15)
>>> tr = TimeRange(2011,8,16,hour=12,minute=30)
>>> tr
TimeRange(2011, 8, 16, 12, 30)
>>> tr = TimeRange(2011,8,16,hour=12,minute=30,left=10,right=10)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'right' is an invalid keyword argument for this function

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class ExtendedList(list):
    def __init__(self, iterable, foo=0):
        list.__init__(self, iterable)
        self.foo = foo

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>>> el = ExtendedList((1,2,3))
>>> el
[1, 2, 3]
>>> el.foo
0
>>> el = ExtendedList((4,5,6),20)
>>> el
[4, 5, 6]
>>> el.foo
20

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class datetime_(datetime):
    def __new__(cls, *args, **kwargs):
        new_datetime = datetime.__new__(cls, *args)
        return new_datetime

class TimeRange(datetime_):
    def __init__(self, *args, **kwargs):
        self.left = self - timedelta(seconds=kwargs.get('left', 0)*60)
        self.right = self + timedelta(seconds=kwargs.get('right', 0)*60)

    def within(self, other):
        return self.left < other < self.right

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class TimeRange(datetime):
    def __new__(cls, *args, **kwargs):
        left, right = kwargs.pop('left', None), kwargs.pop('right', None)
        instance = datetime.__new__(cls, *args, **kwargs)
        instance.left = left
        instance.right = right
        return instance