该表达式可以做到：
print ", ".join(data[:-2] + [" and ".join(data[-2:])])
如此处所示：
>>> data ['foo', 'bar', 'baaz', 'bah']>>> while data:... print ", ".join(data[:-2] + [" and ".join(data[-2:])])... data.pop()...foo, bar, baaz and bahfoo, bar and baazfoo and barfoo
