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Using comments as arguments in python. (lemmy.world)

submitted 2 days ago* (last edited 2 days ago) by raldone01 to c/[email protected]

42 comments fedilink hide all child comments

Python allows programmers to pass additional arguments to functions via comments. Now armed with this knowledge head out and spread it to all code bases.

Feel free to use the code I wrote in your projects.

Link to the source code: https://github.com/raldone01/python_lessons_py/blob/main/lesson_0_comments.ipynb

Image transcription:

from lib import add

# Go ahead and change the comments.
# See how python uses them as arguments.

result = add()  # 1 2
print(result)
result = add()  # 3 4
print(result)
result = add()  # 3 4 5 20
print(result)

Output:

3
7
32

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[–] [email protected] 5 points 2 days ago* (last edited 2 days ago) (3 children)

Hmm, works in php as well!

function add(): float
{
    $trace = debug_backtrace();
    $file = $trace[0]['file'];
    $line = $trace[0]['line'];

    $content = file($file);
    $lineContent = trim($content[$line - 1]);
    $ast = token_get_all("<?php\n{$lineContent}");

    $args = [];
    foreach ($ast as $token) {
        if (!is_array($token)) {
            continue;
        }
        if ($token[0] !== T_COMMENT) {
            continue;
        }

        $commentContent = $token[1];
        if (str_starts_with($commentContent, '#')) {
            $commentContent = substr($commentContent, 1);
        } else {
            $commentContent = substr($commentContent, 2);
        }
        $commentContent = trim($commentContent);
        $commentContent = preg_replace("@\s+@", " ", $commentContent);
        $args = explode(" ", $commentContent);
        $args = array_map(function (string $arg) {
            if (!is_numeric($arg)) {
                throw new InvalidArgumentException('Argument must be a number');
            }

            return str_contains($arg, '.') ? (float) $arg : (int) $arg;
        }, $args);
        break;
    }

    return array_sum($args);
}


echo add(); // 1 2 3
echo add(); // 7 8 9

[–] raldone01 1 points 2 days ago (2 children)

Love this. I am toying with an idea of how to accomplish this in rust.

[–] [email protected] 4 points 2 days ago (1 children)

use std::fs;

fn add_from_comment(file: &str, line: u32) -> f64 {
    let source = fs::read_to_string(file).expect("Failed to read source file");

    let source_line = source.lines().nth((line - 1) as usize).expect("Line not found");

    if let Some(comment_start) = source_line.find("//") {
        let comment = &source_line[comment_start + 2..].trim();
        let numbers: Vec<f64> = comment
            .split_whitespace()
            .map(|num| num.parse::<f64>().expect("Invalid number in comment"))
            .collect();

        return numbers.iter().sum();
    }

    0.0
}

macro_rules! add {
    () => {
        add_from_comment(file!(), line!())
    };
}

fn main() {
    let result = add!(); // 7 8 9
    println!("{}", result); // Outputs: 24
    
    let result2 = add!(); // 1 4 3
    println!("{}", result2); // outputs 8
}

[–] raldone01 1 points 2 days ago

Nice I would have tried it with a build script but this works too. Good job!!!!