Earlier quoted context omitted.
Exactly the road C++ tries to go down. How's that for a ringing endorsement?
C++ is one of the most successful languages.
Rust:- Am i a joke to you?
What’s New in Python 3.8
181–190 of 381 posts
Re: What’s New in Python 3.8
#182Earlier quoted context omitted.
There are programming fonts that use ligatures to convert >= to ≥, or -> to →, so the source code remains in ASCII but symbol sequences show as unique Unicode characters. A next step could be for common dev environments to actually convert symbol/key sequences to operators (how do APL programmers do it?) Avoiding ambiguity and semantic overloading of ASCII symbols would surely help beginners (if also given a UI that…
The Mac has provided easy access to symbols since 1984, with nice mnemonics like these: option-= ≠ option- ≥ option-/ ÷ option-o ø option-w ∑ I don't know why other OSes haven't adopted something similar. The first couple of these were even idiomatic in HyperCard's scripting language.
> nice mnemonics like these:
> option-w ∑
This would grate on me every single time I had to use it. It's an S. Put it on option-s.
Re: What’s New in Python 3.8
#183Earlier quoted context omitted.
Coming from Perl, I used to want this badly, but then I thought that there's absolutely nothing wrong with m = re.match(...) if m is not None: pass Now, I wonder what you meant saying that single-line version is less error-prone, because I don't think so. I believe they're exactly the same in this regard, except for a bizarre case when someone would bastardize the code by putting some irrelevant lines between the ass…
The issue, in my opinion, is when you want something like this: while m := f(many, args): # do stuff with m Now, if you're writing this in Python 3.7, you often end up with some code duplication: m = f(many, args) while m: # do stuff with m m = f(many, args) # duplicate Or something like this: while True: m = f(many, args) if not m: break # do stuff with m Personally, I consider the last version to be the most elegan…
That last one isn't an anti-pattern. That's the pattern concluded best for do-while in the discussion of PEP-315.
Re: What’s New in Python 3.8
#184Is Python now becoming the new C++?
Re: What’s New in Python 3.8
#185Earlier quoted context omitted.
> As a developer who has primarily developed applications in Python for his entire professional career, I can't say I'm especially excited about any of the "headlining" features of 3.8. Python is a fairly old, mature language. What features would you have been especially excited about?
Though not a language feature per say, I would love if the language would take on the packaging ecosystem and deliver a ground up approach that isn't just a kludge on a kludge on a kludge.
It's not great, but also it isn't terrible, the problem with Python packaging is that there were many ways to do it and people are confused. What's worse, there are tons of articles (in including from PyPA) that are providing bad information.
If you use setuptools and place all your configuration declaratively in setup.cfg it is not that bad.
Re: What’s New in Python 3.8
#186Buried in the notes for the `typing` module: > “Final” variables, functions, methods and classes. See PEP 591, typing.Final and typing.final(). The final qualifier instructs a static type checker to restrict subclassing, overriding, or reassignment: > pi: Final[float] = 3.1415926536 As I understand it, this means Python now has a way of marking variables as constant (though it doesn't propagate into the underlying va…
I don't see the point of `final` without an optimizing compiler. Name mangling is sufficient for stashing references to avoid accidental side-effects of overriding.
Re: What’s New in Python 3.8
#187Can I chain the walrus operator? All examples I've seen were part of if/while blocks.
Something like:
r1 = foo(x:=bar)
r2 = baz(x)Re: What’s New in Python 3.8
#188Earlier quoted context omitted.
> As a developer who has primarily developed applications in Python for his entire professional career, I can't say I'm especially excited about any of the "headlining" features of 3.8. Python is a fairly old, mature language. What features would you have been especially excited about?
I'd really like a way to refer to a variable in a outer scope (like global... but not just for global variables).
In the same vein, they could add syntax to distinguish introducing a variable from setting the value of an existing variable.
Python's heuristics for that are pretty annoying.
Re: What’s New in Python 3.8
#189Earlier quoted context omitted.
C++ is one of the most successful languages.
Despite its flaws, not due to them. Same can be said about e.g. Cobol.
Despite the flaws, and because of being in the right place at the right time.
Cobol also was a good idea back in the day. And some of the ideas in Cobol we know recognize as bad _had_ to be tried to gain that recognition.
Re: What’s New in Python 3.8
#190Earlier quoted context omitted.
I actually found an immense use for Walrus - used it to hack Python into doing pattern matching that is way more readable than without it: https://github.com/eveem-org/panoramix (source code for Eveem.org, which is arguably the best decompiler for Ethereum smart contracts out there. you can see a lot of pattern matching in pano/simplify.py , and I found no way to do it without extending the language/walrus while main…
There is a similar trick that you can use without the walrus operator. I wrote the code many years ago and I am reproducing this from memory, so the code below may be a little off. Define this class: class Any: def __eq__(self, other): self.value = other return True Then you can use an instance of it as the hole in a pattern. My use case was performing peephole optimizations in a simple 6502 assembler. For example, i…
But that breaks normal equality tests for your type?