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That be -- TTY relay only -- in skrrpts!

Thank you Arjan! Clear, concise, and to the point. I now know Dependency Injection!

I think Typing and abc's aren't used because the oldest code is already very old and way back then they weren't so common jet.

Very interesting! I would like to know more about the approach of using an external database like SQLite or DuckDB to store the info about the Dutch cities - for example - and how these can be later used in the code

Maybe i'm missing something but why are the commands not inheriting the defined transaction protocol class?

If I am not mistaken, you can use mypy to generate .pyi stubs. The catch: you need to conform to mypy typing requirements, which can involve a lot of work. Do you have an OSS example to implement the provider model better?

I love this idea. I would like to see you start with an example of using the library first to help provide context. But definitely want to see you dive into some complex libraries which make no sense to me.

Sound in this video is not good. There is a deep sound that sounds like someone is hitting the mic.

Yes, do more of these. I liked hearing your unfiltered walkthrough of a Python library. I have 10+ years of experience in Python development and now run a dev team. It's always nice to hear other experienced coders review things. Note for improvement: Your microphone picked up bumps and noises when you hit the desk or your clothes moved.

A video about testcontainers would be very nice

Using 'reduce' to apply functions sequentially seems complicated. Instead, using a monad class seems like a better way to handle exceptions and readability. Using the '__or__' method as a 'bind' method, we can use result = Monad(10) | add_ten | mul_two | div_zero like this. I'd love to hear your thoughts. I'd like to add that it doesn't fit the content of this video because you need to define the Monad class 😁

42:30 what's the point for stub files? Is this yet another silly idea to put more C header files stuff into python?

Faker() works - but you are right, it's confusing. It would be interesting if you could rewrite a skeleton of Faker "done right", maybe with 1 or 2 providers each having a few functions.

I like the format! Studying other peoples code is really a great way to learn :)

Python is, unfortunately , a bad choice for teaching functional programming, primarily because it is statement-based, and not expression-based .

When I saw the video title I thought it will be about impostor syndrome, as in "everyone sometimes feels like under the hood they are a faker". So glad it was not that. And great tips, thank you, this lib will come in useful on my next project.

Good one, thanks

Like this deep dive session, regred that haven't participated it. Awesome idea🎉

This is great, Arjan!! Awesome resource for beginners and experts alike. Please make more of these, and preferrably put them under the Playlist 'Under the hood'.

That was very interesting to watch you in action and seeing whats your train of thought, I like the format!

Great video! One thing that I'd mention is that many of us open-source library developers try to build our code to support all currently supported Python versions (I.e. those that haven't reached end-of-life). Currently, this is 3.8+, meaning we don't yet have access to the parameterized generics on builtins like list, which is why we import parameterized versions from the typing module. Once 3.8 reaches EOL, we won't need to import those anymore, and once 3.9 reaches EOL, we will be able to use the union shorthand (X | Y).

Haven't watched yet, but just based on the description - very cool idea! I always enjoy your content on this sort of thing. Looking forward to watching this one :)

In your next video ,can you do for langchain I hear people say it is complex source code ,I want to hear your views on it

Wow, do more of these please

38:07 You absolutely _do not_ need to duplicate type annotations for package users to get them. Instead, you only have to create an empty py.typed file in the package root, and type checkers will pick that up. .pyi files are only to be used by packages that don't want to add type hints in the code itself.

Ahhh sorry... I totally forgot to give the package a grade at the end! So: I'd give this a 6/10. There's a good attempt at trying to separate generating the various types of data. However, the design heavily relies on object-oriented programming, it does counterintuitive things with module imports, and the proxy class solution is messy in my opinion - that needs a redesign. What are your thoughts? Do you agree? Also: let me know in the comments if you'd like me to do another session like this or not!

This was great. Hearing unedited code review feels more authentic and clicks more for me than hearing the same from a polished, edited video.

Please stop using type hints if it starts accounting for half the video's runtime.

use meaningfull names... continues to use "pi" ad a name.

No offense, but compose seems the kind of thing, sr devs would write to distance themselves from pleb devs. Respectfully, pleb dev.

Maybe I'll never understand why all of this is ever needed.

I'm curious about the test cases for payment.py. Shouldn't we test if the payment processor charge method was called when testing for paying the order? Since "test_pay_order" would pass even if we remove line 17 "payment_processor.charge(card, amount=order.total)" in payment.py. Similarly, shouldn't we test if the order status wasn't changed if ValueError was raised?

reduce does beta reduction i believe

I would argue at 20:09 the function parameter could be Iterable, and have the output be still be an iterator. This way anything that can be iterated over, lists or iterators (or anything implementing __iter__) can be passed and it don't need to cast my inputs with iter(...). I try and make my functions inclusive with Iterable inputs and Iterator outputs, unless there is a specific reason that doesn't work.

💡 Get my FREE 7-step guide to help you consistently design great software: arjancodes.com/designguide.

Thanks 👌

I just shifted from Django to FastAPI, and the unavailability of an ORM was a shock, and then I came across SQLAlchemy, which came as another shock!

What do you think about SQLModel? Its from the FastAPI creators and combines pydantic and SQLAlchemy, as i noticed you don't need to create extra classes for sql and pydantic

in the bubble sort, the inner loop starts from the outer loop starts which means that there are a subset of elements in the beginning that are not sorted.

Hey 👋 I host a project on my own server (under my couch) with Proxmox, running docker behind Opensense and Crowsec firewall, 1GB speed. I use Cloudflare for the DNS and IP proxy. It's possible, but you have to deal with attackers and hackers. So I Splitt up my Homelan into multiple VLan to exclude privat stuff from the container.

Thank you Arjan for the videos you upload, they're very helpful and have a great quality, both in teaching and technical quality, I have learned a lot from you.

thanks for this video man. i'm learning rust while writing pet project and result really bothered me until i found this video.

I find elimination of state to be mostly an obstacle in concurrent programming because atomic operations make threads inherently agnostic of what's going on and whether they should do a/b/c depending on updated conditions, and it also makes it difficult for them to broadcast their own state as it will require an intermediate who would ultimately end up doing exactly what that thread could be doing autonomously (and with less context). It's not impossible to safely allot partitions of a shared workload or state object by using range/slice-types for instance while retaining communicability.

I'm not conviced by the tuple notation when adding a union of type bounds to a generic. Why a different syntax when you already have unions? It feels like types in Python are still an afterthought. I am also surprised by the comments which are against typing altogether. I hope the most important community packages support types

How do i deal with real world implememtation in which i need a way to deal with the dependencies (external libs) that just my plugin will need to run ? Also, plugins will not be in the same path as of my application, specially when I install it as a onefile (using pyinstalller)..so how to deal with the imports? Please could you make a tutorial with a more "real example"?

Dude! This is crazy i wish i could share u our git repo, i watch all ur vids but havent seen this one! Decimal being slow and incorrect is halarious, we in our use case had to use fractional cents because of LLM cost per 1000 tokens was like 0.00025, we um settled on closest like 50 (rounded) was good enough, but i might make a PR to raise it to the token, just by going from 1e6, to 1e8 I guess it makes sense my code emulates urs as i watch a bit, still eerie tho

I hate trendy paradigms. I find that’s writing better code is just simply about building an intuition for what is right to do. There is no silver bullet.