On Sun, Sep 22, 2019 at 09:08:18AM -0000, Nutchanon Ninyawee wrote:
> Link is a language feature that allows multiple variable names to
> always refer to the same underlying object define in a namespace. For
> now, if the variable a link with b. I will denote as a >< b or
> link('a', 'b')
I don't know of any standard term for this, but I would call it
aliasing. It is not quite the same as the version described here:
https://en.wikipedia.org/wiki/Aliasing_%28computing%29
In Python terms, we would say that an alias makes two names refer to
each other, rather than two names referring to a single object.
In current Python:
spam = [42, None]
eggs = spam
# Assignment (name binding) binds both names to the same object.
assert spam is eggs
# Mutations applied through one name affects the other name,
# since they are the same object.
spam.append("hello")
assert eggs[-1] == "hello"
# But re-binding of one name doesn't touch the other.
spam = "something else"
assert eggs == [42, None, "hello"]
With a "name alias", the first two assertions would also apply, but the
third would be different:
spam = [42, None]
eggs >< spam
assert spam is eggs
spam.append("hello")
assert eggs[-1] == "hello"
# But rebinding affects both names.
spam = "something else"
assert eggs == "something else"
eggs = "it works in both directions"
assert spam == "it works in both directions"
Likewise unbinding: ``del spam`` would delete eggs as well, and vice
versa.
Is that what you had in mind?
> More in detail on this link
> https://dev.to/circleoncircles/python-ideas-link-bidirectional-aliasing-in-python-3f20
That's a nice explanation, although I disagree with some of your claimed
benefits.
BTW, your home page https://nutchanon.org/ is currently reporting a 404.
--
Steven
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