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Best AI for coding complex Python applications?

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Hey everyone! I’ve been working on a pretty large-scale Python project lately, and I’m hitting a wall with my current workflow. I’ve been using ChatGPT and GitHub Copilot, but as the codebase grows more complex—especially with intricate asynchronous functions and multiple microservices—I’m finding that the AI often loses track of the project structure or suggests outdated libraries.

I’m looking for an AI tool that can actually 'understand' a deep directory of files rather than just looking at the current snippet I’m editing. Specifically, I need something that excels at refactoring class structures and handling dependency management across different modules without breaking everything. I’ve heard some buzz about Claude 3.5 Sonnet and Cursor, but I’m curious if they truly hold up when dealing with thousands of lines of code and custom internal APIs.

Does anyone have experience using these for high-level architecture planning or debugging complex logic in Python? I’d love to hear which tool you think provides the most accurate, context-aware suggestions for a professional-grade application. What’s your go-to setup for maintaining code quality in large Python environments?


11 Answers
12

yo, i feel u so much on this! i was literally in the same boat a few months ago with a massive microservices project that was basically a spaghetti nightmare. honestly, chatgpt and the standard copilot just cant keep up once you have like, fifty different files all talking to each other, right?

i would suggest you highkey switch over to Cursor AI Code Editor like yesterday!! seriously, its been a total game changer for my workflow. since it is a fork of vscode, it basically just sucks in your entire directory and actually 'sees' how your classes interact across different modules. i use it with the Claude 3.5 Sonnet model and man, it is spooky how good it is at refactoring. i had to redo a whole async dependency injection setup and it handled the imports and logic across three different services without breaking anything.

plus, from a practical standpoint, the Cursor Pro Subscription is sooo worth the twenty bucks a month. you get way more context than the free tier of anything else. sometimes it gets a bit confused if you have like 10,000+ lines, but you can just @-mention specific files to keep it on track. basically, it makes GitHub Copilot feel kinda old school. idk but i honestly cant go back to regular editors now. good luck with the architecture stuff, you got this!! 👍


12

For your situation, I've spent a lot of time thinking about how to keep these massive Python projects from turning into a total safety hazard. Honestly, when you're dealing with complex async logic and microservices, the biggest risk isn't just a bug—it's introducing a subtle architectural flaw that compromises your whole system's reliability.

I know others mentioned some common editors, but for a truly safety-first approach with deep context, I've been experimenting with Continue.dev open-source AI code assistant. It's amazing because you can plug in different models depending on your security and logic needs. If you're worried about the AI hallucinating and breaking your dependency tree, I'd suggest pairing it with Anthropic Claude 3.5 Sonnet API. It's literally the most logical model I've used for refactoring class structures without losing the plot.

Here’s how I handle the complexity:
* **Indexing:** Make sure you actually index your entire codebase so the AI sees your internal APIs.
* **Validation:** I always use Pydantic V2 for my data models because it catches those 'hallucinated' types the AI might suggest before they hit production.
* **Environment Safety:** I run everything through Poetry dependency manager to ensure that if an AI suggests a weird library version, the lockfile blocks the conflict.

Basically, I love Cursor Code Editor, but if you want more control over the safety parameters and which specific model 'reads' your sensitive directory, the Continue.dev extension in VS Code is the way to go. It feels way more professional-grade when you're trying to maintain high code quality in a big microservice environment! gl with the refactor lol


5

Ok so I went through this last year with a massive Django/FastAPI hybrid project that had like 100+ modules. Honestly, I had such high hopes for GitHub Copilot but it kept hallucinating methods from old versions of our internal API, which was SUPER frustrating when I was trying to manage async dependencies. I spent a few months trying to find a setup that didn't cost a fortune but actually understood my file tree.

I eventually tried the Sourcegraph Cody individual plan because it promised better codebase indexing. It was okay, but honestly, it still struggled with the complex class inheritance I had going on. Then I tried the Continue.dev open-source extension for VS Code. It's free, and you can plug in different models. I used it with a local Ollama setup to save on API costs, but unfortunately, the local models just weren't sharp enough for the high-level architecture stuff.

I ended up biting the bullet on Claude 3.5 Sonnet via the API. It's not as cheap as a flat subscription, but the context window handled my directory structure way better than anything else. Lesson learned: sometimes the "all-in-one" tools just can't beat a high-end model and a carefully curated context. It's a bit more manual to manage, but the accuracy is so much higher when you're dealing with spaghetti code! gl with the refactoring, it's a pain.


3

Yeah, I totally agree that keeping everything tied to your Git history is the way to go for long-term projects. I'm still relatively new to the more technical side of these tools, but honestly, my biggest tip is to keep a "project_map.md" file right in your root directory. It basically gives the AI a cheat sheet for your microservices so it doesn't get confused about how they talk to each other. Also, if you're worried about things getting outdated, I've been using OpenRouter to swap between different models depending on the task. It's been super helpful because some models handle async Python way better than others, and you aren't locked into one subscription. Quick tip though: try to keep your prompts focused on one module at a time, even if the tool has full context. Their is way less chance of it hallucinating weird dependency loops that way. Do you guys find that the code stays cleaner if you just let the AI handle the boilerplate instead of the high-level architecture?


3

Helpful thread 👍


2

For your situation, I’ve found that moving away from the standard web-based chats made a huge difference as my projects got more bloated. Honestly, I’ve been through the same struggle with async Python and microservices where the AI just starts hallucinating imports that don't exist lol.

I’ve tried a few different setups over the years:

1. Indexing-heavy tools vs. Basic plugins: The older plugins I used were basically just glorified autocomplete. But my current setup actually indexes the whole workspace. It makes a massive difference for dependency management because it 'sees' how my custom internal APIs are structured across different modules.
2. Cloud-based LLMs vs. Local context: I used to copy-paste code into a browser, which was a nightmare for architecture. Now, the setup I’ve got stays within the editor and keeps track of the file tree. It’s way more accurate for refactoring classes without breaking everything.

Basically, if you want to maintain code quality in a large repo, you gotta use something that handles 'context' by actually reading your local files. My current workflow feels much more 'aware' of my project's deep structure compared to what I was using last year tho.


1

Honestly, if you're trying to keep costs down while managing a massive Python codebase, you gotta look into some DIY CLI-based stuff rather than just another monthly subscription. I've been messing around with a setup that’s way more budget-friendly because you only pay for the tokens you actually use. * Aider is basically a beast for this. It’s a command-line tool that lets you pair program with an LLM directly in your terminal. It hooks into your git repo, so it 'sees' the whole project structure and can refactor across multiple files without getting lost in the sauce.
* If you want to go totally free, try Ollama to run models locally. It’s a bit hit or miss on really complex logic compared to the big paid models, but for basic boilerplate and unit tests, it saves a ton of money.
* Use a "Bring Your Own Key" approach with Open WebUI. You can set up your own RAG (Retrieval-Augmented Generation) system to index your local docs and internal APIs for pennies. It takes a bit more configuration than a plug-and-play editor, but once you get the indexing right, it handles those deep directory structures way better than a standard chat window. It's definitely the move if you're a DIY enthusiast who wants professional results without the $20/month bloat.


1

I spent way too many nights lately benchmarking how different tools actually handle my production load instead of just looking at how pretty the code looks. When you get into thousands of lines of async Python, you realize that just because it runs doesnt mean it is performing well. I had this huge issue where the suggestions were technically correct but created massive bottlenecks in my event loop because the AI didnt understand the overhead of certain database calls inside loops. Tbh, my workflow now is less about which model is smartest and more about how I verify the performance metrics after a big refactor. Here is what I learned from testing my own high-level architecture:

  • I started using a dedicated profiling script to compare my original code against the suggested refactors. Sometimes the tool reorganized my class structures into something more readable but it actually doubled the memory footprint of my microservices.
  • I found that testing concurrency limits is the only way to know if the async logic is actually sound. I saw a huge drop in latency once I stopped letting my setup handle internal API calls blindly and started feeding it specific performance logs to analyze.
  • My current setup works best when I give it the output of a memory profiler alongside the code. It sounds like extra work but when youre dealing with professional-grade apps, you cant just trust the syntax is right. Honestly, if youre hitting a wall with complexity, start looking at the runtime data. It really changed how I view those context-aware suggestions because sometimes the AI is just over-engineering things into a performance nightmare lol.


1

@Reply #7 - good point! I had similar issues recently where I was trying to optimize a high-concurrency data pipeline and the AI suggestions were just... not as good as expected. Honestly, it was pretty disappointing. I spent a whole night debugging why my event loop was stalling because the model suggested a block of code that looked perfect on paper but was totally synchronous under the hood. It didnt catch the blocking call hidden in a library wrapper.

  • ignored the overhead of context switching in our custom event loop
  • missed subtle race conditions in the shared state logic
  • suggested deprecated async syntax that actually slowed down the throughput Its annoying when you realize you spent more time fixing the AI fix than if you had just written it yourself from scratch... anyway, before I look at my data sheets for other setups, I gotta ask a couple things. Are you looking for something that prioritizes raw runtime efficiency over just writing boilerplate faster? Also, do you have a specific ceiling for token costs, or is the budget basically open for the right tool?


1

Ok adding this to my list of things to try. Thanks for the tip!


1

Re: "Ok adding this to my list of things..." - def do that! But honestly, I'm gonna be the outlier and say I actually moved back to my standard setup lately. Don't get me wrong, Cursor is flashy, but being a bit more cautious with my dev environment is a priority for me! I've been testing a couple other things that are seriously amazing:

  • Supermaven Pro is actually wild! The context window is literally 1 million tokens. It is the only thing that doesn't lose the plot when I'm jumping between ten different async modules. Super fast too, like zero lag!
  • JetBrains PyCharm Professional using the built-in AI. Since PyCharm already understands the Python AST so deeply, the AI suggestions feel way more reliable. It rarely suggests fake libraries because it's actually tied to the project index. Switching editors feels like a big risk tho... I'd much rather have these plugins that fit into what I already use and know! Both of these handled my microservices logic way better than I expected without breaking the whole build.


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