dotdavid

Seeed Studio Xiao nRF52840 MeshCore OTA Notes

My notes for the Seeed XIAO nRF52840 & Wio-SX1262, used in various of my solar repeaters.

Check Bootloader Version

To check the bootloader version (firmware 1.14+), log into the repeater and use the CLI to execute the get bootloader.ver command.

OTA Fix Bootloader

karpathy

"""
The most atomic way to train and run inference for a GPT in pure, dependency-free Python.
This file is the complete algorithm.
Everything else is just efficiency.

@karpathy
"""

import os       # os.path.exists
import math     # math.log, math.exp

yamanahlawat

"""
Script to automatically update uv.lock and then update pyproject.toml dependencies.

Prerequisites:
    1. Python 3.11+ (for tomllib)
    2. tomli-w package (`pip install tomli-w`)
    3. uv installed and available in PATH

Usage:
    Run this script: `python upgrade_pyproject.py`

jasonhildebrand

#!/bin/bash

# The use case is that I have an 1024-bit RSA key which I have used for many years to access many remote servers.
# I want to stop using it (don't load it into my ssh-agent), and instead use my new ED25519 key.  
# I need a convenient way to update the authorized_keys file on a remote server.

# This solution is tested and working on Ubuntu 20.04 host
# It works on many distributions/versions of remote servers, including Ubuntu 16.04/18.04/22.04 and CentOS 7.9.

# Instructions:

plexus

#!/usr/bin/env bash

# Import SSH keys from Github to ~/.ssh/authorize_keys for all members of a
# given Github organization.
#
# Will replace authorized_keys, if it looks like authorized_keys was not
# previously created by this script then a backup copy is made.
#
# Depends on jq, will download it if not available (assumes Linux) to ~/bin/jq
#

jsomers

Using websockets to easily build GUIs for Python programs

I recently built a small agent-based model using Python and wanted to visualize the model in action. But as much as Python is an ideal tool for scientific computation (numpy, scipy, matplotlib), it's not as good for dynamic visualization (pygame?).

You know what's a very mature and flexible tool for drawing graphics? The DOM! For simple graphics you can use HTML and CSS; for more complicated stuff you can use Canvas, SVG, or WebGL. There are countless frameworks, libraries, and tutorials to help you draw exactly what you need. In my case, this was the animation I wanted:

(Each row represents a "worker" in my model, and each rectangle represents a "task.")

Syncrossus

""" This module contains a simple identicon creation utility function.
    Original color palette : coolors.co/659bd8-ff776d-ffd793-9eefae-c99dba
"""
import hashlib
import random
import png  # requires pypng (version 0.0.19 recommended)
import sys

palette = {0: (255, 255, 255),
           1: (101, 155, 216),

EvieePy

import discord
from discord.ext import commands

import sys, traceback

"""This is a multi file example showcasing many features of the command extension and the use of cogs.
These are examples only and are not intended to be used as a fully functioning bot. Rather they should give you a basic
understanding and platform for creating your own bot.

These examples make use of Python 3.6.2 and the rewrite version on the lib.

simonw

How to recover lost Python source code if it's still resident in-memory

I screwed up using git ("git checkout --" on the wrong file) and managed to delete the code I had just written... but it was still running in a process in a docker container. Here's how I got it back, using https://pypi.python.org/pypi/pyrasite/ and https://pypi.python.org/pypi/uncompyle6

Attach a shell to the docker container

Install GDB (needed by pyrasite)

apt-get update && apt-get install gdb

IRC client in pure bash 4

#!/bin/bash

#no PATH, no way to accidently run any programs
PATH=''

#useful variables
term_height=0
term_width=0
term_scroll_height=0
status_line_row=0