python - 默认情况下 __eq__() 方法里面有什么

Question

我读过这个(来自 here ):

User-defined classes have __eq__() and __hash__() methods by default; with them, all objects compare unequal (except with themselves) and x.__hash__() returns an appropriate value such that x == y implies both that x is y and hash(x) == hash(y).

我想知道默认情况下 __eq__() 方法是否定义如下:

def __eq__(self, other):
    return hash(self) == hash(other)

Answer 1

不，更像是:

def __eq__(self, other)
    return self is other

您不能使用 hash()，因为不同的对象可能具有相同的哈希值。