擅长:python、mysql、java
<p>见<a href="https://stackoverflow.com/questions/8796886/is-it-safe-to-just-implement-lt-for-a-class-that-will-be-sorted">this previous question</a>。答案是,只需使用<code>__lt__</code>,就可以逃脱惩罚,但最好使用<a href="http://docs.python.org/library/functools.html#functools.total_ordering" rel="nofollow noreferrer">^{<cd2>}</a>。</p>