/g/ - Technology

The Little Schemer (and its continuations) have a very nice dialogue-like structure to them, which takes a bit of practice to read effectively, but once you are used to it, is a delight to read. The examples it use are very fun, too. I was told that it is an example of "programmed instruction" but other books labelled programmed instruction are nowhere near this masterpiece.

This is a textbook written for students whose introductory programming class used a functional programming language, the concrete examples are in SML. It teaches C and imperative programming through translating functional programs into efficient and idiomatic C programs. Sometimes the translations are quite formal, other times somewhat heuristic.

Yo, there’s also Library Genesis for textbook PDFs. It’s fucking great.

>>226
>Is the format even the same for CPython, PyPy and other Python interpreters? Sorry for the questions, I have no idea how it works.
https://docs.python.org/3/glossary.html#term-bytecode
"""Python source code is compiled into bytecode, the internal representation of a Python program in the CPython interpreter. The bytecode is also cached in .pyc files so that executing the same file is faster the second time (recompilation from source to bytecode can be avoided). This “intermediate language” is said to run on a virtual machine that executes the machine code corresponding to each bytecode. Do note that bytecodes are not expected to work between different Python virtual machines, nor to be stable between Python releases.

A list of bytecode instructions can be found in the documentation for the dis module."""

https://docs.python.org/3/library/dis.html
"""The dis module supports the analysis of CPython bytecode by disassembling it. The CPython bytecode which this module takes as an input is defined in the file Include/opcode.h and used by the compiler and the interpreter.

CPython implementation detail: Bytecode is an implementation detail of the CPython interpreter. No guarantees are made that bytecode will not be added, removed, or changed between versions of Python. Use of this module should not be considered to work across Python VMs or Python releases."""

>I was hoping for something more detailed
https://github.com/python/cpython/blob/3.8/Python/compile.c

>>227
Looks like I just need to RTFM. Do they somewhere also explain why they decided to keep the bytecode implementation defined?

>>228
I'm not aware of a direct statement of the rationale behind that decision – it's not in e.g. the Design and History FAQ [0]. The spirit of The Python Language Reference suggests that it was specified in terms of an abstract execution model [1] precisely to allow more freedom for Alternate Implementations [2].

[0] https://docs.python.org/3/faq/design.html
[1] https://docs.python.org/3/reference/executionmodel.html
[2] https://docs.python.org/3/reference/introduction.html#alternate-implementations

>>224
When running a python program, the following steps are taken:
Python source code -> abstract syntax tree (AST) -> bytecode
Hy replaces the "Python source code -> AST" step.

We should note that bytecode is an implementation detail.
CPython has its own format, Jython compiles to JRE bytecode, and other implementations can use more complicated means such as running and compiling simultaneously (JIT compilation).


>>226
>Maybe they do it like this because there's no portable bytecode format?
It's simpler if you just replace the "source code -> AST" step.
AST is the ideal model to compile your code to
because it is the same level of abstraction as it's input (source code).
You can easily see create and run your own AST with python's ast library.
It's pretty trivial to even implement a simple language yourself using that library.

>>234
Doesn't it make a lot of optimizations impossible to do? Since you are basically translating your semantics into sugar-free Python.

Have you thought of joining wirechan maybe?

>>186
wirechan is in pretty good shape alreadythey got everything on point for the theme they're going for i think, i just wanted to make a image/textboard in a different theme that is not very popular with imageboard users, it was just an idea that i threw out with my friend and he said he would be down to make it but i wasn't supposed to be i guess.

Do you have a cool webspace fren?

>>187
Yeah, I have a small landing page for my ZNC and that stuff, plus my friends are working on a revival for an ib they had, plus another one has his own ib and I help them moderate it.

>>79
if only I did

Cool people use Arch with OpenRC.

>>82
I've got Void with runit on my laptop right now, pretty good so far.

>>82
no cool person uses Arch, stop spreading lies