"""A more or less complete user-defined wrapper around list objects.""" class UserList:    def __init__(self, initlist=None):        self.data = []        if initlist is not None:            # XXX should this accept an arbitrary sequence?            if type(initlist) == type(self.data):                self.data[:] = initlist            elif isinstance(initlist, UserList):                self.data[:] = initlist.data[:]            else:                self.data = list(initlist)    def __repr__(self): return repr(self.data)    def __lt__(self, other): return self.data <  self.__cast(other)    def __le__(self, other): return self.data <= self.__cast(other)    def __eq__(self, other): return self.data == self.__cast(other)    def __ne__(self, other): return self.data != self.__cast(other)    def __gt__(self, other): return self.data >  self.__cast(other)    def __ge__(self, other): return self.data >= self.__cast(other)    def __cast(self, other):        if isinstance(other, UserList): return other.data        else: return other    def __cmp__(self, other):        return cmp(self.data, self.__cast(other))    def __contains__(self, item): return item in self.data    def __len__(self): return len(self.data)    def __getitem__(self, i): return self.data[i]    def __setitem__(self, i, item): self.data[i] = item    def __delitem__(self, i): del self.data[i]    def __getslice__(self, i, j):        i = max(i, 0); j = max(j, 0)        return self.__class__(self.data[i:j])    def __setslice__(self, i, j, other):        i = max(i, 0); j = max(j, 0)        if isinstance(other, UserList):            self.data[i:j] = other.data        elif isinstance(other, type(self.data)):            self.data[i:j] = other        else:            self.data[i:j] = list(other)    def __delslice__(self, i, j):        i = max(i, 0); j = max(j, 0)        del self.data[i:j]    def __add__(self, other):        if isinstance(other, UserList):            return self.__class__(self.data + other.data)        elif isinstance(other, type(self.data)):            return self.__class__(self.data + other)        else:            return self.__class__(self.data + list(other))    def __radd__(self, other):        if isinstance(other, UserList):            return self.__class__(other.data + self.data)        elif isinstance(other, type(self.data)):            return self.__class__(other + self.data)        else:            return self.__class__(list(other) + self.data)    def __iadd__(self, other):        if isinstance(other, UserList):            self.data += other.data        elif isinstance(other, type(self.data)):            self.data += other        else:            self.data += list(other)        return self    def __mul__(self, n):        return self.__class__(self.data*n)    __rmul__ = __mul__    def __imul__(self, n):        self.data *= n        return self    def append(self, item): self.data.append(item)    def insert(self, i, item): self.data.insert(i, item)    def pop(self, i=-1): return self.data.pop(i)    def remove(self, item): self.data.remove(item)    def count(self, item): return self.data.count(item)    def index(self, item, *args): return self.data.index(item, *args)    def reverse(self): self.data.reverse()    def sort(self, *args, **kwds): self.data.sort(*args, **kwds)    def extend(self, other):        if isinstance(other, UserList):            self.data.extend(other.data)        else:            self.data.extend(other)