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"""Drop-in replacement for collections.OrderedDict by Raymond Hettinger http://code.activestate.com/recipes/576693/ """ from UserDict import DictMixin class OrderedDict(dict, DictMixin): def __init__(self, *args, **kwds): if len(args) > 1: raise TypeError('expected at most 1 arguments, got %d' % len(args)) try: self.__end except AttributeError: self.clear() self.update(*args, **kwds) def clear(self): self.__end = end = [] end += [None, end, end] # sentinel node for doubly linked list self.__map = {} # key --> [key, prev, next] dict.clear(self) def __setitem__(self, key, value): if key not in self: end = self.__end curr = end[1] curr[2] = end[1] = self.__map[key] = [key, curr, end] dict.__setitem__(self, key, value) def __delitem__(self, key): dict.__delitem__(self, key) key, prev, next = self.__map.pop(key) prev[2] = next next[1] = prev def __iter__(self): end = self.__end curr = end[2] while curr is not end: yield curr[0] curr = curr[2] def __reversed__(self): end = self.__end curr = end[1] while curr is not end: yield curr[0] curr = curr[1] def popitem(self, last=True): if not self: raise KeyError('dictionary is empty') key = reversed(self).next() if last else iter(self).next() value = self.pop(key) return key, value def __reduce__(self): items = [[k, self[k]] for k in self] tmp = self.__map, self.__end del self.__map, self.__end inst_dict = vars(self).copy() self.__map, self.__end = tmp if inst_dict: return (self.__class__, (items,), inst_dict) return self.__class__, (items,) def keys(self): return list(self) setdefault = DictMixin.setdefault update = DictMixin.update pop = DictMixin.pop values = DictMixin.values items = DictMixin.items iterkeys = DictMixin.iterkeys itervalues = DictMixin.itervalues iteritems = DictMixin.iteritems def __repr__(self): if not self: return '%s()' % (self.__class__.__name__,) return '%s(%r)' % (self.__class__.__name__, self.items()) def copy(self): return self.__class__(self) @classmethod def fromkeys(cls, iterable, value=None): d = cls() for key in iterable: d[key] = value return d def __eq__(self, other): if isinstance(other, OrderedDict): return len(self)==len(other) and \ all(p==q for p, q in zip(self.items(), other.items())) return dict.__eq__(self, other) def __ne__(self, other): return not self == other