class Link(object): empty = () def __init__(self, first, rest=empty): self.first = first self.rest = rest def__len__(self): return 1 + len(self.rest) def __getitem__(self, i): if i == 0: return self.first return self.rest[i - 1] def __repr__(self): if self.rest is empty: return 'Link({})'.format(repr(self.first)) return 'Link({}, {})'.format(repr(self.first), repr(self.rest)) def seq_to_link(seq): new = Link.empty for elem in seq[::-1]: new = Link(elem, new) return new seq_to_link([1, 2, 3, 4])
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