@Volcan-kf3oz
This guy really know what he is doing every video I've seen he able to break it down to where even a person new to python can understand "if you can't explain it simply, you don't understand it well enough." - Albert Einstein
@auroraRealms
Although I like the ability to learn and use Data Classes. All my years of database programming has taught me to use JSON, and Dictionaries as much as possible. Especially in Web Services. The caveat to using Data Classes is that; changing a column type, name or description, or adding or removing columns ends up as a use case/feature ticket for the programmer which can take a bit of time to run through the development cycle. These column changes are guaranteed to happen all the time, in the life cycle of the product. A second problem, is that the code must be completely thrown out, when starting a new product. Using Dictionaries very often can allow these column changes from config files without recompiling or restructuring the code base. Going back to Web Services. Dictionaries can be web requests and responses, in JSON, without translation. This makes for high performance, and easy maintenance in the life cycle of product. It also makes copying and pasting the code directly into other products a possibility.
@aminramazanifar9743
The final note about slot was really great. Thanks
@Saidffff
Nice one Arjan! Also, _slots_ give faster attribute access AND space savings in memory due to switching to a more compact data structure. When you create many instances of the class, that is another advantage. Got that from reading 'Python distilled', written by the venerable David M. Beazly.
@naderbazyari2
I am modifying my code in pycharm right now according to your tips. Awesome video. Much much appreciated.
@borisvujicic7817
This is great. ArjanCodes, have you thought about doing a video about Python descriptors? I think it could be very useful, as there is no good ones on YouTube.
@JoshuaSmeda
I really love your videos on these subjects - keep it up!
@Kwaku959
OMG, I been working on this project and for like 3 days I been trying assign a class and return something! Great Video!
@barrykruyssen
Hi Arjan. Great video, very well presented. I've just found your channel and will be watching all your videos as time permits. I'm a retired software engineer (started back in the early 80's). 5 weeks ago I decided, in my retirement, to switch back to linux (and python - which I have never used), just for fun, after 25 years in microsoft products (prior to that I was in the Unix world). I'll be changing 2 of my classes to data classes ASAP. I have just read your Software Design Guide and agree with much of what you've written. I think you have glossed over the most important aspect "Who’s it intended for?". Determining who is doing what, why they do it and what they expect from it and then managing the expectations is the key to a successful implementation. You do mention your “zoom out and zoom in” approach which probably encompasses this but in my planning, the people are the key and if there are problems in this area it can be very costly down the track (we qualified our prospective clients and if the people problem was too great we walked away from deals), as you say we write the code for the client, not for us. Thanks
@XCanG
I use similar thing when working with fastapi, library named SQLModel, what it basicaly is very similar to dataclass, but it has validation from pydantic, so if you, say assign to person with a name type int, like Person(name=1), then you get ValidationError exception. It is more useful in fastapi as it may be used as a mechanism to prevent API being called and executed if provided arguments are not match. And you can have more validation methods in Field, like: le, ge, lt, gt; for list types you may provide min/max range, for strings you may add regex or even something more custom via function. I like it a bit more than just dataclass
@alexl4447
Thank you for this explanation. I‘m beginner, with just three years experience, and I have seen this video multiple times. This time I understood all you‘ve said. I don‘t know, why you using a konsole for presenting, and Not Spider, where you can See all variables in the variable-Explorer
@JohnnysaidWhat
Great video really interesting topic had no idea the data class decorator existed. Just a small suggestion. The top end eq on your voice is a little shrill. DeEsser or small eq to lower the high freq bands. Thank you for this video all the same!
@JoshPaulie
If you're printing an object you'd expect the repr to be printed, not str, no? Thanks for videos! Enjoying this one on my lunch break 😋 Every few seconds I find myself yelling "wait what?!" Learned a lot!!
@cheesecake_mafia
I think you might find this interesting if you don't already know, but you can define class variables while using @dataclass. You just need to import ClassVar from typing and then when you are defining the class variables, use ClassVar after the colon and then put square brackets and the datatype of the class variable. I think this feature was mentioned in the documentation and also Tech with Tim channel helped me realise this. Great Video! Cheers.
@jaa928
Thank you for the clear and concise explanation. As an experienced programmer, but newcomer to python this was an excellent, example-driven discussion.
@christensencode7538
Your videos on dataclasses are awesome! I've used them for a few projects and they really help.
@christopheanfry
Thank you so much for this video and for the design guide I’ve just download, it’s literally gold 🙏
@BSK_Rick
The most surprising thing is to realize that you actually type your code at that speed and you don't speed up in the video editing
@nicolasRebagliati
if you use init=False, the repr=False should be implicit. Because if not the repr generated is invalid, because repr should generate an object equal to the original if you copy and paste it. Also you forgot to mention that if you use slots you cant not add attributes in runtime to your object
@ArjanCodes