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在 Python 中，curA == curB 和 curA is curB 是两个不同的操作： == 比较的是两个对象的值是否相等（调用 __eq__() 方法）。 is 比较的是两个对象的身份是否相同（即是否指向内存中的同一个对象）。 在这个链表相交的问题中，我们是想找两个链表在内存中首次相交的节点，所以判断的是：是否是同一个节点对象，而不是值是否相同。值相同并不代表是同一个节点。
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在 Python 中，curA == curB 和 curA is curB 是两个不同的操作：
== 比较的是两个对象的值是否相等（调用 eq() 方法）。
is 比较的是两个对象的身份是否相同（即是否指向内存中的同一个对象）。
在这个链表相交的问题中，我们是想找两个链表在内存中首次相交的节点，所以判断的是：是否是同一个节点对象，而不是值是否相同。值相同并不代表是同一个节点。