This is some javascript level shit
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I fucking hate this, thanks OP
That's disgusting
Thank you, I hate it
IMO comments should never ever be parsed under any circumstances but I probably don't know enough to really speak on this
No, your intuition is correct, this is extremely cursed.
Seen in a code review (paraphrased):
"Why does this break when you add comments in the middle?"
Why would python even expose the current line number? What’s it useful for?
On a serious note:
This feature is actually very useful. Libraries can use it create neat error messages. It is also needed when logging information to a file.
You should however never ever parse the source code and react to it differently.
You underestimate the power of us, print debuggers.
Why wouldn't it? Lots of languages do. In C++ you have __LINE__
.
Because it doesn't seem like a useful feature. The only occasion I imagine this could be helpful is with logging to the console to track when the function breaks, but even then - still trivial to replace.
One case where I find it useful, tho it operates in a more limited way, is code in block blocks within code comments in Rust, which are also printed out in the generated documentation. They essentially get ran as part of your unit tests. This is great for making sure that, eg, your examples left in code comments actually work, especially if they’re written in a way that functions like a unit test.
Some languages use the comments to generate documentation. Something like
// function to add two numbers func Add(num1 int, num2 int)
The add
function in the example above probably traverses the call stack to see what line of the script is currently being executed by the interpreter, then reads in that line in the original script, parses the comment, and subs in the values in the function call.
This functionality exists so when you get a traceback you can see what line of code triggered it in the error message
It's quite useful to parse comments and generate documentation from them, either as plain old hypertext or in your editor with LSP.
That sounds fine if you have something reading the file independently. But the actual executable code should not be able to access its own comments.
As if I needed more reasons to start away from python
You can so stupid shit in any language. I admit Python doesn't exactly make it difficult. A bit like JS, but different.
Do you stay away from C++ too? You can do this there too
https://en.cppreference.com/w/cpp/utility/source_location/line
Being able to get the line number is very different from comments being parsed.
Edit: didn't realize this was custom code built to be cursed.
You should look at how OPs example works first maybe
The python interpreter isn't parsing comments, the add() function is just getting the current line number from the call stack context, and using a regex to spit out the numbers to the right of the "#" on the current executing line of the source code.
Yeah fair I was just assuming this was standard library, I see your point now.
checks the community to make sure I'm in programmer humor
Yeah that checks out
You know that this is acutally working right??? 😊
Yup, just one of those posts that could of course work in either
Implementation of the add()
function is here: https://github.com/raldone01/python_lessons_py/blob/main/lib.py
Yup, the function actually goes and finds the code that calls it and parses the comment.
Disgusting.
This does not actually work, right? Right?
Anakin:
Anakin:
The add()
function (that is available in the source code) basically uses some built in debugging tools to find out where in the code the function is called, and then parses the comment from the file and uses it for adding stuff.
I’ve never tried (becuse why would you…) but something similar can probably be built in any interpreted language
It’s not something Python does by design
Thanks :) ! Could you tell me what use case/purpose such function can have from a dev perspective?
This stuff is normally used for creating human readable error messages. E.g. printing the line of your code that actually set off the exception
We actually use method comments for user documentation as well. Only on specific business methods, but it's nice to have a good comment for the dev and a tooltip for the user at the same time.
I'd say nothing that can't be achieved by docstrings.
This specific use case? To make a meme, mainly ¯\(ツ)/¯
As for the components: Parsing comments have been used for stuff like type hints / formatting / linting, tho generally not at run time (afaik).
The tooling for finding out where something is called from can be used to give a better understanding of where things go wrong when an exception happens or similar, to add to logs.
I would say that in general you don’t need either functionality except for certain edge-usecases
Thank you ! 😄
Every day further from god's light etc...
What? There is no lib
module.
$ python3.13 -c 'import lib'
Traceback (most recent call last):
File "<string>", line 1, in <module>
import lib
ModuleNotFoundError: No module named 'lib'
$
OP wrote this add() function and has provided their own lib module in the source code.
Oh, so it’s not Python that’s cursed.
One of Python’s design philosophies is—or at least was—“we are all consenting adults here.” If you really want to turn Python into Brainfuck, the interpreter isn’t going to stop you.
I feel sick
Why, just why
Makes sence if u think about it. We use comments as docstrings that the interpreter has an understanding of. Python lets u fuck with its internals (at least in an immutable manner) so why not fuck with comments.