def last(seq):
    """Returns the last item in the sequence or iterator.
       Returns None if the sequence is empty."""
    try:
        return seq[-1]
    except IndexError:
        return None
    except TypeError:
        item = None
        for item in seq:
            pass
        return item
Returns the last item in the sequence or iterator.
       Returns None if the sequence is empty.
funcy/seqs.py