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3 points by akkartik 428 days ago | link | parent

> Do you want to avoid the situation.. where when you need the sqrt you have to include the whole math file? I totally agree.

Yes, definitely. In the Javascript world it's called tree-shaking: https://medium.com/@Rich_Harris/tree-shaking-versus-dead-cod...

> from library import function as good_name_for_your_project

What's happening here is that you're a) adding a feature in Python to support 'from..as', b) including an external library and c) continuing to keep around an old name that you don't really care about. You're essentially preserving the old name just because other people who your application doesn't care about use it.

Imagine a world where maintaining forks was tractable. Would this still be a good idea? Why not just do a search and replace and maintain a private fork, eliminating all this complexity in your private stack? Just delete 'from..as' from your private Python! :o)

> I'm not sure making a copy of a library is a good idea because it would lead the user to have many copies of the same libraries.

Yes, this is a fundamental difference in outlook/ideology. I think that copying isn't always bad. We culturally tend to emphasize the issues with copying a lot more than the costs of avoiding duplication.

A degenerate example is to observe that there are tons of 'e's in the novel I'm reading and try to deduplicate them. That is of course obviously farcical, but it at least serves to illustrate that there's a trade-off, and that always DRY'ing your code isn't obviously a good idea. Another example is to observe that the internet has many copies of the same libraries running at any given time. You can argue that they're on different machines, but then imagine a 'machine' consisting of multiple cores and private caches and non-uniform memory access and RAID-partitioned disks. Changing latency costs can make it reasonable to maintain multiple copies of some immutable data in a single 'machine'. Now consider that development is yet another cost that is open to variation. If (automatically) creating copies of something eases development, it's at least worth considering. For example, optimizing compilers can sometimes specialize a function differently for different callsites. That's duplication often inside a single binary, and it makes sense in some contexts.

The npm eco-system promiscuously duplicates dependencies inside the node_modules/ directory, so that is at least some evidence that the approach I'm suggesting isn't too insane :)



2 points by Oscar-Belletti 427 days ago | link

Ok, this maybe could be the way to go. Adapting little libraries isn't a problem, and it probably makes your program better. This defeats collisions, useless code and is ok for autoloading. But this approach will work only if our libraries will be small enough. For now this is ok.

Duplicating libraries isn't a problem: disk space for ease of development is an exchange which is getting more and more convenient.

For autoloading: the interpreter/compiler could load all .arc files in current directory (or current-directory/lib), or scan them for function definitions (without loading them) and making elisp autoload automatically for every function. I prefer the first option.

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2 points by digitalis_ 427 days ago | link

One possibility for this bundling is that Arc looks first where it would expect a library to be (in an equivalent of npm_modules), then looks for it in the usual place (/usr/lib or wherever).

Or, if it all needs to be bundled, you could have symlinks for the libraries you don't change.

What do you think?

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