try:
    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