> def lastdetecter(iterable): > "fast iterator algebra" > lookahead, t = tee(iterable) > lookahead.next() > t = iter(t) > return chain(izip(repeat(False), imap(itemgetter(1), > izip(lookahead, t))), izip(repeat(True),t))
More straight-forward version:
def lastdetecter(iterable):
t, lookahead = tee(iterable)
lookahead.next()
return izip(chain(imap(itemgetter(0), izip(repeat(False),
lookahead)), repeat(True)), t)
Raymond
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