Python 中的指针？ ` x.pointerDest = y.pointerDest`?

我正在把我的老问题分成几个部分，因为它非常混乱here https://stackoverflow.com/questions/4590407/how-can-i-evaluate-variable-to-another-variable-before-assigning。这个问题与此相关answer https://stackoverflow.com/questions/4590407/how-can-i-evaluate-variable-to-another-variable-before-assigning/4590450#4590450和这个answer https://stackoverflow.com/questions/4590407/how-can-i-evaluate-variable-to-another-variable-before-assigning/4590456#4590456。我尝试理解指针，甚至不确定它们是否存在于 Python 中。

# Won't change x with y=4
>>> x = 0; y = x; y = 4; x
0

# Won't change y
>>> x = 0; y = x; x = 2; y
0

#so how can I change pointers? Do they even exist in Python?
x = 0
y.pointerDestination = x.pointerDestination   #How? By which command?
x = 2
# y should be 0, how?

[更新2：已解决]

也许，关于存在的矛盾陈述There are no pointers in Python. and Python does not have the concept of a "pointer" to a simple scalar value.。最后一个是否推断存在指向其他内容的指针，从而使第一个语句无效？

Python 中的标量对象是不可变的。如果您使用非标量对象（例如列表），您可以执行以下操作：

>>> x = [0]
>>> y = x
>>> y[0] = 4
>>> y
[4]
>>> x
[4]
>>> x is y
True

Python 没有指向简单标量值的“指针”的概念。