CMCDragonkai

import os
import fcntl
import contextlib
import time


@contextlib.contextmanager
def lockpidfile(filepath):
    with os.fdopen(
        os.open(filepath, os.O_RDWR | os.O_CREAT, mode=0o666),

CMCDragonkai

Duplex Async Generator

This code demonstrates the how to combine a reading generator and a writing generator together into a duplex generator.

The duplex generator will simultaneously read and write at the same time from both the readable and writable generator.

Throwing an exception throws it to the writable generator, but we continue on (but make sure to skip 1 iteration by using the errored flag).

We use the null value to indicate the ending of the generator, it ends both reading and writing sides.

CMCDragonkai

Understanding systemd Boot Execution Graph

https://serverfault.com/questions/617398/is-there-a-way-to-see-the-execution-tree-of-systemd

On NixOS:

> systemctl get-default
multi-user.target

CMCDragonkai

NPM Clean - Needed if SHA1 hashes are appearing

npm cache clear --force
rm -r node_modules/
rm package-lock.json
npm install

CMCDragonkai

Edit the Boot Command Line with systemd

If you hit a boot error where there is a start job that cannot be terminated, you can enter the systemd debug shell.

To do this, at the systemd-boot menu, hit the e key and specify: systemd.debug-shell=1.

In the future you can do this in configuration.nix:

systemd.additionalUpstreamSystemUnits = [ "debug-shell.service" ];

CMCDragonkai

Flexbox Sidebar with Overflowing Grid Items

Most flexbox layouts work by using the intrinsic sizing.

This means the sizes of boxes are determined by the size of the contents.

This is usually a good thing because you want your layout to stretch to the content, but also to the available space.

This makes layouts "flexible".

CMCDragonkai

#!/usr/bin/env node

import process from 'process';

async function main(argv = process.argv): Promise<number> {
  process.exitCode = 0;
  return process.exitCode;
}

if (require.main === module) {

CMCDragonkai

import time
import asyncio
import logging
import uvloop
import aiojobs.aiohttp
import sys
from aiohttp import web
import aioprocessing
import concurrent.futures

CMCDragonkai

How to Combine Discounts

Suppose you have $1000 dollars, and you are applying 40% discount first, then 42% discount second.

What is the total discount?

1000 - 0.4*1000 - (0.42 * (1000 - 0.4*1000)) = 348
I - D1*I - (D2 * (I - D2*I)) = O
I - D1*I - D2*I + D1*D2*I = O

CMCDragonkai

<template>
  <button @click="counter += 1">{{ counter }}</button>
</template>

<script lang="ts">
import { defineComponent, ref } from 'vue';

export default defineComponent({
  setup () {
    // by using ref, the counter becomes a proxy