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    frozenset
except NameError:
    #Import from the sets module for python 2.3
    from sets import Set as set
    from sets import ImmutableSet as frozenset
class MethodDispatcher(dict):
    """Dict with 2 special properties:
    On initiation, keys that are lists, sets or tuples are converted to
    multiple keys so accessing any one of the items in the original
    list-like object returns the matching value
    md = MethodDispatcher({("foo", "bar"):"baz"})
    md["foo"] == "baz"
    A default value which can be set through the default attribute.
    def __init__(self, items=()):
        # Using _dictEntries instead of directly assigning to self is about
        # twice as fast. Please do careful performance testing before changing
        # anything here.
        _dictEntries = []
        for name,value in items:
            if type(name) in (list, tuple, frozenset, set):
                for item in name:
                    _dictEntries.append((item, value))
            else:
                _dictEntries.append((name, value))
        dict.__init__(self, _dictEntries)
        self.default = None
    def __getitem__(self, key):
        return dict.get(self, key, self.default)
#Pure python implementation of deque taken from the ASPN Python Cookbook
#Original code by Raymond Hettinger
class deque(object):
    def __init__(self, iterable=(), maxsize=-1):
        if not hasattr(self, 'data'):
            self.left = self.right = 0
            self.data = {}
        self.maxsize = maxsize
        self.extend(iterable)
    def append(self, x):
        self.data[self.right] = x
        self.right += 1
        if self.maxsize != -1 and len(self) > self.maxsize:
            self.popleft()
    def appendleft(self, x):
        self.left -= 1        
        self.data[self.left] = x
        if self.maxsize != -1 and len(self) > self.maxsize:
            self.pop()      
    def pop(self):
        if self.left == self.right:
            raise IndexError('cannot pop from empty deque')
        self.right -= 1
        elem = self.data[self.right]
        del self.data[self.right]         
        return elem
    def popleft(self):
        if self.left == self.right:
            raise IndexError('cannot pop from empty deque')
        elem = self.data[self.left]
        del self.data[self.left]
        self.left += 1
        return elem
    def clear(self):
        self.data.clear()
        self.left = self.right = 0
    def extend(self, iterable):
        for elem in iterable:
            self.append(elem)
    def extendleft(self, iterable):
        for elem in iterable:
            self.appendleft(elem)
    def rotate(self, n=1):
        if self:
            n %= len(self)
            for i in range(n):
                self.appendleft(self.pop())
    def __getitem__(self, i):
        if i < 0:
            i += len(self)
        try:
            return self.data[i + self.left]
        except KeyError:
            raise IndexError
    def __setitem__(self, i, value):
        if i < 0:
            i += len(self)        
        try:
            self.data[i + self.left] = value
        except KeyError:
            raise IndexError
    def __delitem__(self, i):
        size = len(self)
        if not (-size <= i < size):
            raise IndexError
        data = self.data
        if i < 0:
            i += size
        for j in range(self.left+i, self.right-1):
            data[j] = data[j+1]
        self.pop()
    def __len__(self):
        return self.right - self.left
    def __cmp__(self, other):
        if type(self) != type(other):
            return cmp(type(self), type(other))
        return cmp(list(self), list(other))
    def __repr__(self, _track=[]):
        if id(self) in _track:
            return '...'
        _track.append(id(self))
        r = 'deque(%r)' % (list(self),)
        _track.remove(id(self))
        return r
    def __getstate__(self):
        return (tuple(self),)
    def __setstate__(self, s):
        self.__init__(s[0])
    def __hash__(self):
        raise TypeError
    def __copy__(self):
        return self.__class__(self)
    def __deepcopy__(self, memo={}):
        from copy import deepcopy
        result = self.__class__()
        memo[id(self)] = result
        result.__init__(deepcopy(tuple(self), memo))
        return result
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