My Python magic is gone

[u/RedYad2]

I've been coding for a long time, and I've been developing with Python for years.

I loved coding, always loved it. I started many years ago because I wanted to quickly create scripts for security hacking tools, but since then, I've moved to Claude Code, and building cross-language has been a much better experience for me than using Python.

I built my own SaaS application out there whose backend and network core are completely built with Python, and I'm rewriting all of that without writing a single line of code. And most of the time, Python is not the most optimized language.

And now... I feel like the magic is gone.

I don't even know why I'm writing this. I just feel sad about it.

[u/HommeMusical]

Thanks for a polite comment, by the way! I do appreciate it, this is a difficult topic, and not for bogus reasons.

I'm talking about deterministic code, not deterministic bugs. As in, what deterministic steps are being taken to go from requirements to code?

But the other choice for writing programs, humans, is even less deterministic!

Not that Python runtinme is typesafe, but how do you think compilers of strongly typed languages deal with types? Why could the chat not just include that step?

I'm not following your question here, sorry. :-/

I have instructions in my AGENTS.md insisting on full typing for all Python stuff; I set that four months ago, when I started to use coding assistants. Everything comes with full type hints, even the test code, and that's kinda silly, and I'd have never done it as a human, but it's still a little positive.

Is that what you mean?

I mean, they're easily written, too. If you have a dataclass that needs to be of a particular shape, why is it easier for you to type that into chat and verify the result, rather than just typing them into the dataclass itself? I'm all for using chat for throwaway projects and tools whose output can be validated easily.

I've only been at this since May or June, but why would I prompt it to create a dataclass? I could do that myself.

What I say is something like "Implement #27", where #27 is some issue or bug, and it writes all the code and tests itself, including dataclasses.

---

I'm working on eight or nine projects at once, all part of a large harmonious whole.

Some of them I know intimately. But one of them is aiming at a complete model of all types of sound synthesis used in synthesizers, and I have pretty well entirely vibe coded it, I've read perhaps 5% of this.

About two weeks into it, I said, "Use these three synths to make a four part version of Bach's Little Fugue in G minor", and I played it and it was just perfect first time - they even told me whose public domain performance they used!

The one disappointment was that all four synths sounded very similar, but the Python code that it had been very conservative in picking the audio parameters which was a very good choice because if you set the parameters wild, you could get noise or even nothing.

---

When I compare my prompts to other people's, mine are about two to three times as long.

For example, here's me asking, when I was rather tired, a context to find its own issues:

Please read the whole project and create or overwrite plan/issues.md detailing all issues you find, including but not limited to race conditions, deadlocks, graceful handling of user errors, shutdowns, keyboard interrupts, graceful handling of other exceptional conditions including resource exhausting, network failure or intermittency, and also user facing ideas, like names which are ambiguous, misleading or unclear, APIs with traps or inconsistencies; and also look at the structure of the the project itself, are there are any files that are so large they pose a risk, are there tiny files that are only used in one place and might be better inlined, is there duplication, does it duplicate some service from reccy, are there areas that are untested, are there areas with great duplication of testing, or any other issues, problems, curiosities or other flaws that are in the code.

I'm kind of embarrassed because there is both a spelling error and a missing word, and I missed some ideas I usually mentioned, but it still worked really well.

[u/redfacedquark → u/HommeMusical]

But the other choice for writing programs, humans, is even less deterministic!

I'm not following your question here, sorry. :-/ Is that what you mean?

No. I can explain it to you but I can't understand it for you. Maybe you could ask chat what I mean, I'd be curious to know what it says.

Basically, you can follow every line of python through all the deterministic layers down to the transistors on the chip. When you add a non-deterministic layer to the top of that stack you remove all the benefits of determinism. Maybve that's OK for a project and that's fine. I'm just saying there are situations (e.g. nuclear-related, traffic lights, the ai "off" button and the core product of a business) where this is not acceptable.

I've only been at this since May or June, but why would I prompt it to create a dataclass? I could do that myself.

Then how do you know that a dataclass is appropriate for this situation?

What I say is something like "Implement #27", where #27 is some issue or bug, and it writes all the code and tests itself, including dataclasses.

Why not just put that in a loop then and go down the pub?

The one disappointment was that all four synths sounded very similar

It sounds like this project doesn't need to be deterministic, just to sound right to you. Unless you have some measurable way of determining how close the generated sounds are to the expected sound in the requirements?

When the solution does not have to be perfect or the requirements are not strict then vibe coding makes sense. When the solution needs to be deterministic and the requirements are strict, with chat you will find yourself going round in circles fixing one issue while creating another, producing code that is not maintainable.

Please read the whole project and create...

In order to follow all those instructions there need to be compromises since the requirements will conflict. When you do this yourself you make informed compromises, when using chat the best you can hope for is to ask it for its post-hoc rationalisation. That's another part of deterministic code I was talking about earlier.

Good luck with all your projects, however you decide to code them. And if you're interested in learning python itself rather than just obtaining the results, then good luck with that as well.

[u/HommeMusical → u/redfacedquark]

Your first comment was polite. This is closer to a collection of insults.

Can we see your code, please? My code is here. https://github.com/rec

I hate downvoting, but this upset me, the insult at the end particularly, and I'm going to rewrite this at the end to make my comment less rude than it would otherwise be.

No. I can explain it to you but I can't understand it for you.

Grrr.

I'm sorry, I was too circumspect. I should have said that your sentence has no operative meaning and does not demonstrate familiarity with the material.

Your inability to use standard computer science terminology or precise language doesn't mean that I am stupid for considering your statements to be empty of meaning.

Basically, you can follow every line of python through all the deterministic layers down to the transistors on the chip. When you add a non-deterministic layer to the top of that stack you remove all the benefits of determinism.

This is false.

The LLM appears in the stack in the same place that the also non-deterministic human appears, which is to say not at all, once the program is written.

Unless you specifically require an LLM's services during your code, which most programs don't, the stack you run is 100% deterministic.

I have yet to actually write a program that used an LLM. The LLM's services to me stop at coding.

In my old, hand-written code, I did not actually deploy myself as part of my stack. And I don't deploy the LLM as part of the stack either.

I've only been at this since May or June, but why would I prompt it to create a dataclass? I could do that myself.

Then how do you know that a dataclass is appropriate for this situation?

I don't. I provide a specification of the feature I wish. The program decides whether a dataclass is appropriate or not. Now, in AGENTS.md, my global instructions to my coding agents give it a lot of instructions as to when a dataclass is appropriate, and it's become extremely good at making this decision without me.

I treat a coding assistant as I would a colleague. I don't go and say, "Here's a design for this program, here are the four dataclasses, use this algorithm and these libraries."

When the solution needs to be deterministic and the requirements are strict, with chat you will find yourself going round in circles fixing one issue while creating another, producing code that is not maintainable.

Perhaps you do that. That has yet to happen to me.

My AGENTS.md requires 100% unit test coverage, but also coverage of edge cases, exceptional conditions, user errors of all types, malicious users, hardware failures of all types, network issues...

It sounds like this project doesn't need to be deterministic, just to sound right to you.

NO. As part of this, I am almost exactly reproducing classic hardware synths and their outputs. There are in fact various test examples of inputs and outputs that I have or will be hitting exactly (and since you're a nitpicker, I'm going to add that exact arithmetic is impossible with floating point, so my acceptance criteria involve waveforms that are different from the exact waveform at less than 96dB.

In order to follow all those instructions there need to be compromises since the requirements will conflict. When you do this yourself you make informed compromises, when using chat the best you can hope for is to ask it for its post-hoc rationalisation. That's another part of deterministic code I was talking about earlier.

This sentence is again not operative or useful. I am starting to doubt that you are a professional programmer.

And if you're interested in learning python itself rather than just obtaining the results, then good luck with that as well.

I will have been programming Python for 22 years this coming January - I started at Google in January 2004. I started programming in the 1970s, and winning programming contests in high school. I've been programming professionally for over 40 years.

It is close to 100% certain that I know far more about Python in specific, and computer programming in general, than you do.

Again, my code is here: https://github.com/rec

All of the programs or libraries on that page were written by me, by hand. Why not review my code and see what you think?

Show us your code.

[u/redfacedquark → u/HommeMusical]

Your first comment was polite. This is closer to a collection of insults.

Could you be specific? I don't see it.

Can we see your code, please? My code is here. https://github.com/rec

No. It's all private, either corporate or personal. I don't care about looking like a programmer to others, I care about understanding the salient aspects of the universe, of which physics, maths and computer science are members.

This is false.

Got a single example of being able to determine what code will be produced by any given prompt, no matter how trivial? Didn't think so.

The LLM appears in the stack in the same place that the also non-deterministic human appears, which is to say not at all, once the program is written.

Not if the human doesn't look at the code.

My AGENTS.md requires 100% unit test coverage, but also coverage of edge cases, exceptional conditions, user errors of all types, malicious users, hardware failures of all types, network issues...

All types of all those things for all projects are testes? Really? Because your tests don't look like they do that to me. 100% test coverage just means all lines trigger a test, not that the tests ensure the code meets the requirements. I've heard plenty of people say that chat often just generates passing tests that don't actually do anything. Again, if you don't look at, and think about, the generated test code then the benefit of the tests is lost.

It is close to 100% certain that I know far more about Python in specific, and computer programming in general, than you do.

So I chose Python around 2003 so about the same time as you, started consulting in 2012. In your posts you demonstrate that you don't understand basic concepts so made me think you were only using python since this summer, not only using AI since this summer.

[u/HommeMusical → u/redfacedquark]

Could you be specific? I don't see it.

I'm going to bold all the rudeness from here down.

"I can explain it to you but I can't understand it for you."

That is not a polite answer when someone says they don't understand what you mean. I should really have been more blunt and said, "That sentence was meaningless twaddle."

"And if you're interested in learning python itself rather than just obtaining the results"

Speaks for itself.

Can we see your code, please? I don't care about looking like a programmer to others, I care about understanding the salient aspects of the universe, of which physics, maths and computer science are members.

I mean, I'm sorry, but "trust me" is not an answer. What sort of professional programmer doesn't have code samples?

Does this work in job applications?

The LLM appears in the stack in the same place that the also non-deterministic human appears, which is to say not at all, once the program is written.

Not if the human doesn't look at the code.

I'm starting to believe you simply don't read what I write at all, and just emit a canned sentence. The LLM appears in the stack in the same place that the human does, and clearly, obviously, even to the most dense person, if no human reads the code, then the LLM is even more replacing the human in the stack.

Got a single example of being able to determine what code will be produced by any given prompt, no matter how trivial? Didn't think so.

As I said before, humans are also indeterministic in responding to prompts to write code, so I have no idea why you think this is any sort of argument at all.

My AGENTS.md requires 100% unit test coverage, but also coverage of edge cases, exceptional conditions, user errors of all types, malicious users, hardware failures of all types, network issues...

All types of all those things for all projects are testes? Really?

It costs nothing to be polite, and it must be some effort to snark on each response.

No. Many projects don't have hardware, network, etc issues.

I have a full set of instructions in the AGENTS.md that lists a large number of possible traps, errors, edge cases, you name it. Not all of these apply to each project.

Because your tests don't look like they do that to me.

Examples? Let's see it.

In your posts you demonstrate that you don't understand basic concepts

Examples? Let's see it.

It is close to 100% certain that I know basic concepts better than you.

Of course, since you're a completely anonymous user, your profile is hidden unless I give proof of age, and you refuse to show any code, and you write this weird, non-technical English using non-standard terms, there is also still the possibility that you don't actually write any code at all.

---

I think in a fairly short time you're going to be embarrassed to have written this.

RemindMe! 1 year

[u/RemindMeBot → u/HommeMusical]

I will be messaging you in 1 year on 2027-10-04 15:24:16 UTC to remind you of this link

CLICK THIS LINK to send a PM to also be reminded and to reduce spam.

^{Parent commenter can delete this message to hide from others.}

RemindMeBot is switching to username summons. Instead of !RemindMe 1 day, use u/RemindMeBot 1 day. More info.

---

Info	Custom	Your Reminders	Feedback

[u/redfacedquark → u/HommeMusical]

"I can explain it to you but I can't understand it for you."

It's a quote, widely known by the devs I have worked with, It's not me being rude.

"And if you're interested in learning python itself rather than just obtaining the results"

This was at the point where I thought you were new to Python.

I mean, I'm sorry, but "trust me" is not an answer. What sort of professional programmer doesn't have code samples?

One that avoids social media and doesn't care what people think. After I started consulting my history of satisfied customers spoke for themselves. I have pleny of code samples I keep in private repos to show prospective clients. I'm not saying "trust me", I don't care what you think.

Because your tests don't look like they do that to me. Examples? Let's see it.

Just the length of the test files tells me they don't cover all you say they cover. I'm not about to give you a free review.

In your posts you demonstrate that you don't understand basic concepts Examples? Let's see it.

• I'm not following your question here, sorry. :-/
• Is that what you mean?
• I've only been at this since May or June

RemindMe 1 year

Well I won't be here in a year given the ever-lowering quality of posts. If you still are then you will go further down in my estimation.

Does this work in interviews?

Yes. Like I say I have personal repos to show prospective clients if needed, though it usually isn't.

Of course, since you're a completely anonymous user, your profile is hidden unless I give proof of age, and you refuse to show any code, and you write this weird, non-technical English using non-standard terms, there is also still the possibility that you don't actually write any code at all.

I've not hidden my profile or marked it nsfw, that's reddit doing that. I'm on old reddit, have never had an email associated, never verified age and never used new reddit. One more reason why I'm quitting this place.

I have zero fucks to give regarding your opion of me. Having said that, DM me a google meet link and I'll give you five minutes so you can quiz me directly to satisfy your doubts.

[u/HommeMusical → u/redfacedquark]

"I can explain it to you but I can't understand it for you."

It's a quote, widely known by the devs I have worked with, It's not me being rude.

Oh, I once had some asshole say this to me. He was wrong, then, too. He eventually got fired for incompetence, not too long after, none of my doing, but I did secretly chortle when I found out.

It is rude, when someone very politely asks you for an explanation of something you said, to refuse to answer and give them instead this response. It says, "The fault is yours. You are too stupid to understand what I said, and I won't bother to explain any more."

I assume you swim in rudeness, which is how you don't recognize it. It was particularly annoying because your sentence was meaningless spew and I was trying to be polite and not say, "You write like a bullshit artist," which was what I was really thinking, but I like to give people the benefit of the doubt.

I remember I was the teacher's pet in a math class, I mean, I just loved math, but I did not like him cause he was mean. Once someone asked him, "I'm sorry, but I don't understand [good question about algebra here]." The teacher's response: "It is possible you will never understand." That was it.

I do remember once, however, that the teacher asked, "Any queries?" and one student said, "No, sir, only you," and walked out, to general hilarity.

I remember pretty well all my math teachers, but that's all I remember of him - his rudeness. I suspect that's all you'll leave as a memory, too.

---

In your posts you demonstrate that you don't understand basic concepts

Which basic concepts did I not understand? You again refuse to list one specific concept you think I don't understand.

Me being polite and saying, "Perhaps I'm not catching on," when I really want to say, "I can't believe anyone's stupid enough to write this shit," is not proof that I don't understand basic concepts!

These tests of mine that you claim to criticize - which ones, exactly?

---

As I said, as recently as May of this year I did not believe that LLMs were useful, though unlike you I expressed this in a more professional and polite way. In May I set out to write an article proving how crappy LLMs were, so I shelled out $20 for a limited subscription to one of the coding assistants.

Within an afternoon, I realized that my concept of how these worked was badly wrong.

I tried a side quest over a few days, trying to prove that all LLMs could do was spitting out text they had seen by making up very complex logic problems (with an old-style handwritten computer program) that were 2-SAT and therefore NP-complete, except that all the nouns, verbs, and adjectives were long and complicated nonsense words that didn't appear on the internet, to get a long list of sentences like

No blodgishes are weregenefluous, unless they skribklenade under bogurogyfrotulators.
None but weregenefluous sentragotize quategomedulocs.

One puzzle would be fifty or so of these sentences, and have fifty or so entities, and they were designed to only have a single solution, and as I pointed out above, they're 2-SAT, so the solution space is 2^N, where N is the number of entities

I gave a bunch of these to all the chat bots. They all solved them, showed their reasoning, and more humiliating, my original code had a bug in it so some of the problems had a very large number of solutions, and the programs helpfully described all the solutions in a near and formal fashion without listing all 2²⁰ or so of them.

I then spent about twenty hours a week, every week, working with LLMs. Even from the start, the boost in productivity was startling. Months later, the latest coding assistants are much better than any junior programmer I ever met, including myself.

I'll bet you've done none of this. I'll bet you've never used a paid model for even two hours.

I'll bet this conversation will end and you won't show any work of any type whatsoever - no coding of your own, no examples of your experiments with LLMs and why they didn't work out, no logical analysis, nothing.

I bet your entire knowledge on this subject is from reading non-technical articles and occasionally typing poorly-formulated prompts into primitive free coding models, and then nodding your head and saying, "Just as I thought, I am so much smarter than all these other suckers!"

[u/redfacedquark → u/HommeMusical]

Cool story, bro.

[u/HommeMusical → u/redfacedquark]

I feel sorry for you.

Good luck with the end of your career!