[Python-ideas] Re: Introduce constant variables in Python

tabeb qena writes: > Great Idea, I have joined the mailing list to write the same idea. > > As I can't find the great difference between Final and Constant, > So, I will use the name Final. > > I suggest one the following syntax: The syntaxes proposed already are fine. The problem is mo

[Python-ideas] Re: Introduce constant variables in Python

On Thu, Jun 17, 2021 at 10:50 AM Chris Angelico wrote: > On Fri, Jun 18, 2021 at 12:43 AM Wes Turner wrote: > > > > > What would be the advantage of such a declaration? > > > > Constants don't need to be locked or unlocked; which is advantageous for > parallelism and reasoning about program corr

[Python-ideas] Re: Introduce constant variables in Python

On Fri, Jun 18, 2021 at 12:43 AM Wes Turner wrote: > > > What would be the advantage of such a declaration? > > Constants don't need to be locked or unlocked; which is advantageous for > parallelism and reasoning about program correctness. > True consts (wherein everything referred to in that obj

[Python-ideas] Re: Introduce constant variables in Python

On Mon, May 24, 2021 at 5:43 PM Chris Angelico wrote: > > Requiring that a name not be rebound is well-defined and testable. > Requiring that an object not change is either trivial (in the case of, > say, an integer) or virtually impossible (in the case of most > objects). > What would be the a

[Python-ideas] Re: Introduce constant variables in Python

Great Idea, I have joined the mailing list to write the same idea. As I can't find the great difference between Final and Constant, So, I will use the name Final. I suggest one the following syntax: from collection import Final 》x = Final(100) 》print(x) 》100 》y = x*2 》Print(Y) 》200 》print (

[Python-ideas] Re: Introduce constant variables in Python

Sorry for the name conflict. I tried to type Steven D'Aprano but instead it resulted in Steve D'Aprano ___ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3

[Python-ideas] Re: Introduce constant variables in Python

Reply to Steve D'Aprano - I am talking about constant name binding. Once the name is bind it cannot be changed. The data will remain immutable or mutable. > That seems very odd. That would mean that you can't pass constants to > functions, or put them in lists or dicts, since that would create

[Python-ideas] Re: Introduce constant variables in Python

"Constant variables" is a contradiction in terms. If it is constant, it cannot be a variable, and vice versa. Can we be more precise in the language used please? We have two independent concepts here: * name bindings: names can be bound to a value, or unbound with the `del` statement; * val

[Python-ideas] Re: Introduce constant variables in Python

On Tue, May 25, 2021 at 8:09 AM Joren wrote: > > We could define "change" in terms of the hash of the object the name points > to, as well as the name itself (the pointer to the object). The hash of a random.Random() object doesn't change when its state does (its derived solely from its id). Nor

[Python-ideas] Re: Introduce constant variables in Python

-1 for all of this unless it’s included as part of a bigger change that has proven performance benefits when constants are used On Mon, 24 May 2021 at 23:10, Joren wrote: > We could define "change" in terms of the hash of the object the name > points to, as well as the name itself (the pointer t

[Python-ideas] Re: Introduce constant variables in Python

We could define "change" in terms of the hash of the object the name points to, as well as the name itself (the pointer to the object). ___ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org

[Python-ideas] Re: Introduce constant variables in Python

On Tue, May 25, 2021 at 7:30 AM Joren wrote: > > typing.Final actually means something like "cannot be reassigned", whereas > constant variable means "cannot change". Consider e.g. > > class Spam: > def __init__(self): > self.eggs = 0 > > @final # method cannot be overridden (wh

[Python-ideas] Re: Introduce constant variables in Python

typing.Final actually means something like "cannot be reassigned", whereas constant variable means "cannot change". Consider e.g. class Spam: def __init__(self): self.eggs = 0 @final # method cannot be overridden (which is more related to "reassignment" than to "change")

[Python-ideas] Re: Introduce constant variables in Python

Thomas Grainger: > This is already available with typing.Final and immutable types: > > from typing import Final > > ham: Final = 3 > ham = 4 # Error > > hams: Final[Sequence[str]] = ["ham", "spam"] > hams.append("meat") # Error I'm not sure whether it's a reply to me or someone else. But anyways

[Python-ideas] Re: Introduce constant variables in Python

This is already available with typing.Final and immutable types: from typing import Final ham: Final = 3 ham = 4 # Error hams: Final[Sequence[str]] = ["ham", "spam"] hams.append("meat") # Error On Mon, 24 May 2021, 18:40 Abdur-Rahmaan Janhangeer, wrote: > Greetings, > > Just a light-hearted

[Python-ideas] Re: Introduce constant variables in Python

Greetings, Just a light-hearted note, if ever the idea is taken seriously, variable: constant = 10 seems more pythonic to me. constant variable = 10 opens the doors for int x = 5 etc Kind Regards, Abdur-Rahmaan Janhangeer about | blog