How to Create Very Very Special Class with too many magic methods ?

[snippsat]

I can not understand what you mean.
This make no sense example = "bar"
This just overwrite class object example.
There are no function in your example,it's called method when belong to a class.
If a function is placed in class it has @staticmethod decorator.

To run the class just to make it clear what it dos:

>>> example = PointerVariable("foo")
>>> example.for_use_of_variable_without_calling()
'foo'
>>> example.val
'foo'

# Change val to bar
>>> example.new_value('bar')
>>> example.for_use_of_variable_without_calling()
'bar'
>>> example.val
'bar'