不，is是直接指针比较，id只是将转换为的对象地址返回long。
来自ceval.c：
case PyCmp_IS:
res = (v == w);
break;
case PyCmp_IS_NOT:
res = (v != w);
break;
v和w这里简单PyObject *。
static PyObject *
builtin_id(PyObject *self, PyObject *v)
{
return PyLong_FromVoidPtr(v);
}
PyDoc_STRVAR(id_doc,
"id(object) -> integer\n\
\n\
Return the identity of an object. This is guaranteed to be unique among\n\
simultaneously existing objects. (Hint: it's the object's memory address.)");
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