擅长:python、mysql、java
<p>不能在实例级别重写特殊方法。<a href="http://docs.python.org/reference/datamodel.html#new-style-special-lookup" rel="nofollow noreferrer">For new-style classes, implicit invocations of special methods are only guaranteed to work correctly if defined on an object’s type, not in the object’s instance dictionary</a>。在</p>