[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] Currying syntax with multiple parameter lists

> Flat is better than nested. I remember being confused a lot when I was learning how to write my first decorator. Now eight years later, with the last two spent full-time writing Python, I introduced a bug in production because I forgot to return the inner function from within a decorator.

[Python-ideas] Re: Decorators on variables

On 5/24/21 6:36 PM, micro codery wrote: > Variable decorators have been suggested here before, as have new statements > that could also achieve the same level of access to the binding name. However > I propose a much more restricted syntax that would make for less edge cases > where what is

[Python-ideas] Re: Decorators on variables

I don't have much of substance to say other than this proposal really made me go "oh I like that" several times. There may be downsides/arguments against I'm not considering, but I look forward to following the conversation and hope it gets a serious hearing. On Mon, May 24, 2021, 9:38 PM micro

[Python-ideas] Decorators on variables

Variable decorators have been suggested here before, as have new statements that could also achieve the same level of access to the binding name. However I propose a much more restricted syntax that would make for less edge cases where what is actually passed to the decorator callable may be

[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; *

[Python-ideas] Re: match expressions in python 3.10

On the other hand I think extending the walrus operator would make the change less intrusive and the syntax more easily discoverable: if match := re.match(r"...", some_string): print(match[1], match[2]) if [_, a, b] := re.match(r"...", some_string): print(a, b) # Assuming match objects

[Python-ideas] Re: match expressions in python 3.10

On Mon, May 24, 2021 at 07:55:07PM -, Tyler F wrote: > with the addition of PEP 634 and the new match/case syntax in python > 3.10, it seems fitting to be able to use these new match statements > inside of expressions as well, Python 3.10 isn't even showing up on the Downloads page yet:

[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).

[Python-ideas] Re: match expressions in python 3.10

ehhh in my opinion its more pythonic to use a keyword in this case, especially since that seems to be the main way it is currently done with statements being turned into expressions ___ Python-ideas mailing list -- python-ideas@python.org To

[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

[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] Re: symbolic math in Python

Aside from the type conversion dunders (e.g. `__bool__`), and the `and`, `or` and `in` operators, this is possible right now: You can create a `Symbol` class that returns another `Symbol` in the compatible operator dunder methods, while internally maintaining a list of (operator, args,

[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

[Python-ideas] Re: match expressions in python 3.10

There was a discussion about this a couple months ago but instead of adding a new keyword the idea was that the walrus operator could be upgraded from simply being a binding operator to matching patterns supported by the match statement. if ["example", *files] := variable: print(files) If

[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] match expressions in python 3.10

with the addition of PEP 634 and the new match/case syntax in python 3.10, it seems fitting to be able to use these new match statements inside of expressions as well, which is why I think we should have a new `matches` keyword (similar to if/else, is, for, not, etc.) for use in expressions.

[Python-ideas] Re: Add support for private variables, methods and functions in Python

On Sun, 23 May 2021 at 19:50, Chris Angelico wrote: > > On Mon, May 24, 2021 at 3:38 AM Marco Sulla > wrote: > > > > > Do you yearn for actual refactoring tools - which do exist? > > > > > > > > Renaming tools of IDE do not work in 100% of the cases. For example, > > > > if you have _variable in

[Python-ideas] Re: dict.get_deep()

On Sun, 23 May 2021 at 19:41, Todd wrote: > > The pytoolz/cytoolz project already has this: > https://toolz.readthedocs.io/en/latest/api.html#toolz.dicttoolz.get_in It seems a project that is used by many people. I think that JSON is so much used that that function could be added to the builtin

[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

[Python-ideas] Introduce constant variables in Python

Many times a programmer would want a variable that will be a constant. The programmer could have been careless and suddenly changed a very important variable. Proposed syntax, constant variable = 10 variable = 20 # Error Now constant means making a variable value immutable. It means now we can