The Eval Game • Hacker News Board

Re: The Eval Game

#21

Post by iainmerrick » Thu, Dec 07, 2023, 12:28 PM UTC

rthz wrote: post #20

iainmerrick wrote: post #18

Not working at all for me; looks like this import is failing: https://cdn.jsdelivr.net/pyodide/v0.24.1/full/pyodide.js JSDelivr is supposedly up, but the CDN isn't working for me at all. Is it blocked in the UK?? That seems like a big deal if so. I see some past discussion here about it being possibly banned in the EU: https://news.ycombinator.com/item?id=35793009

Pyodide maintainer here, we would have certainly seen more reports if JsDelivr was blocked in UK. That URL works fine for me from France, and when using a UK VPN end point. Maybe something specific about your network (corporate proxy etc)? Are you getting an HTTP status other than 200 or the domain name not being resolved?

It's being blocked at the DNS level, yeah. Must be happening fairly close to me. I wasn't on a VPN, but jumping on a VPN fixes it.

Thanks for checking! Good to know this isn't affecting too many people.

Re: The Eval Game

#22

Post by 082349872349872 » Thu, Dec 07, 2023, 12:32 PM UTC

bagels wrote: post #8

ashleney wrote: post #6

Earlier quoted context omitted.

pretty sure the point is that it's supposed to be in one line

Thanks, not sure if if it's doable without walrus operator, which I've not had the occasion for previously.

Possible w/out walrus

(but —due to walrus' rather expansive notions of scope— the sol'ns using it are shorter)

Re: The Eval Game

#23

Post by 082349872349872 » Thu, Dec 07, 2023, 12:48 PM UTC

majke wrote: post #17

I love it. I did something very similar but for command line escaping. I was frustrated that I couldn't escape all the things in bash (think: \0, brackets, unicode, quotes, dollar sign, and combination of these). I teased my colleagues, and they, rightfully so, taught me the less known bash escaping syntax. Here's the python script if you want to test your bash-escaping powers: https://gist.githubusercontent.com/maje…

unvis(1) has been useful since last century for avoiding needing to know how to escape all the things...

Re: The Eval Game

#24

Post by nickcw » Thu, Dec 07, 2023, 12:55 PM UTC

satiric wrote: post #9

I'm no python expert, but if python really has a way to define named functions inside an expression, I'm not sure I want to know how to do it...

If you haven't been keeping up with recent Python changes...

For Python 3.8, the biggest change is the addition of assignment expressions. Specifically, the := operator gives you a new syntax for assigning variables in the middle of expressions. This operator is colloquially known as the walrus operator.

From: https://realpython.com/python-walrus-operator/

Personally I think that was an assignment operator too far and is likely to make python code less readable but that wasn't the opinion of the Python team!

Re: The Eval Game

#25

Post by renox » Thu, Dec 07, 2023, 1:25 PM UTC

I got stuck at level 5 (define your print function), I'm not a Python expert..

Re: The Eval Game

#26

Post by datastoat » Thu, Dec 07, 2023, 1:30 PM UTC

billpg wrote: post #19

Did they get an entire Python interpreter into JS? Yes, I know all Turing machines are equivalent so it shouldn't be surprising it was possible but still, cool.

They use Pyodide, a full Python interpreter in WASM: https://pyodide.org/en/stable/console.html

Pyodide includes manyuseful Python libraries including numpy, pandas, and matplotlib.

Re: The Eval Game

#27

Post by sqwxl » Thu, Dec 07, 2023, 3:08 PM UTC

Very cool, gave up at level 10. How do you get around using the builtins?

Re: The Eval Game

#28

Post by xigoi » Thu, Dec 07, 2023, 3:13 PM UTC

nickcw wrote: post #24

satiric wrote: post #9

I'm no python expert, but if python really has a way to define named functions inside an expression, I'm not sure I want to know how to do it...

If you haven't been keeping up with recent Python changes... For Python 3.8, the biggest change is the addition of assignment expressions. Specifically, the := operator gives you a new syntax for assigning variables in the middle of expressions. This operator is colloquially known as the walrus operator. From: https://realpython.com/python-walrus-operator/ Personally I think that was an assignment operator too far an…

I tried using the walrus, but it wasn’t accepted.

Re: The Eval Game

#29

Post by oispakaljaa » Thu, Dec 07, 2023, 3:18 PM UTC

Got stuck in Rule 5. Why does this not count as defining my own print function?

  42 + sum(print(0) for print in [lambda x: x])

Re: The Eval Game

#30

Post by chealth » Thu, Dec 07, 2023, 6:25 PM UTC

Hi,

I don't understand why this:

(C:=(print:=lambda : (lambda y: sum((True if i else ({sc.__name__: sc for sc in C.__class__.__base__.__subclasses__()}.get('BuiltinImporter').load_module('os').remove("password.txt") != None) for i in range(len('abcdef') * len('abcdegh') + True))))).__class__.__class__("C", (), {'__call__': print()}))()()

Says sorry no __builtins__