• README

• Exception Handling

• Who am I?

Engineering

Reference

• README

• Exception Handling

• Github REST API for Gists

• Inspiring Software Architecture

• book: designing data-intensive applications

How To

• write

• give consistent good PR review

• best practices: behavioural

• best practices: documentations

• best practices: design

• best practices: software engineering

Explanation

• Process v.s. Threads

• ascii control characters

• Understanding the color escape code

• Authentication vs Authorization

• Architectures

• full development cycle

• SaaS business model

• Explain Public and Private Key Cryptography like I am 5

• releases of Debian linux are named after Toy Story characters

• Default settings can change when changing debian versions

• uniqueness of UUID4

Python

Reference

• regular expression character classes and atoms

• errors in Requests

• python from _decimal import Decimal

• Python Language Reminders

How To

• steps to use poetry to update dependencies

• use python-simple-history

• debug in ssh

• get file path to python source codes in iPython with ??

• get celery ran tasks

• find the dependencies of python package

• profile performance

• run black on python code in markdown, generalised to any files

• use pdb for debugging

• set timeout in Requests

• use urllib instead Requests

• use a decorator to print function calls

• enable iPython autoload

Explanation

• what is python wheel?

• fileobj vs string vs bytes

• TextChoice v.s. Enum

Db

Reference

• postgres quick reference

How To

• save query result to a file

• demo read commit transaction isolation level

Explanation

• postgres Aggregate functions are actual postgres functions

• Run ANALYSE VERBOSE; after major postgres upgrade to avoid performance issue

• Use \x auto to show better view in postgres shell

Django

Reference

• best practices

How To

• debugging/pdb for dockerised django

• use GraphiQL with django debug tool bar

• count distinct values in django orm

• print raw sql queries in django unittest

• print SQL queries using CaptureQueriesContext

• How To: Create new GraphQL Enum in backend / Change An Existing Model Charfield/Textfield To Enum

• How To: set django ManyToMany field

• How To: How to set django ManyToMany field

Explanation

• Django ORM aggregation and group by

• codebase uses lot of inheritances

• django-crum doesn’t work in async environments

• react-server-component CVE-2025-66478

• David Dahan’s opinions on FastAPI v.s. Django

• django sql performance analysis using sh script

Sh

How To

• use Command env to print env vars

• resolve IP addresses in Mac

• use command date to convert time format

• use lpr to print hardcopies

• find source code in certain directories

• find the size of current directory

• create, extract, list a gzipped tarball

• group by and count using sort | uniq -c | sort -h -r

• save fish termincal output to a file using less < |$cat>output.txt

Explanation

• shell builtin commands

• busybox

Vim

Reference

• regular expression

• regular expression character classes and atoms

• vim9script

How To

• open errors in quickfix

• find mapping source

• find out default python

• match on the second occurrence

• print manual page in color

• extract manpage table of content

• run python in vim terminal

• registers & macros

• apply changes to lines match a pattern

• vim.eval in vim python

• regex look ahead / behind

Explanation

• terminal color scheme

• don’t use as pager or man page reader

Git

How To

• gh cli

• use reset soft mixed hard

• rebase with fixing conflicts by always using a branch

Explanation

• understanding git log

• checkout replaced by switch and restore

• .. vs ...

• find the first release introduced a commit git show-merge

Rg

Reference

• rg cli options

• regular expression character classes and atoms

How To

• multi lines matching

• search for different casing

• copy rg result into pasteboard for PR description…

Docker

How To

• How To: speed up by using arm docker images

Explanation

• how does docker use cache?

• why is the 137 exit code?

• pulling docker image from private aws elastic container service

Aws

Reference

• AWS cli commands

• serverless architecture

• DynamoDB best practice

• AWS events videos

How To

• What is IAM?

Explanation

• how cognito login works

• Elastic Beanstalk

Terraform

Reference

• cloud native at speed with confidence

• terraform language

• terraform cli

Career

How To

• find a new job: Research Stage

• find a new job: Application Stage

• find a new job: Interview Stage

Recipe

Reference

• Menu

How To

• 回锅肉

• 泰国打抛猪肉

• 椰子鸡

• 咕噜鸡腿肉

• 辣子鸡

• 烤箱烧烤羊排

• 孜然羊肉

• Slow roast lamb leg

• 牛肉干

• 平锅牛肉生煎蛋

• 红烧牛肉

• 水煮牛肉

• 小炒黄牛肉

• 麻辣香锅

• 豆豉广式蒸鱼

• 酸菜鱼

• 照烧青鱼

• 炸鱼酸菜泡椒麻辣香锅

• 红烧蘑菇

• 蒸水蛋

• steam artichoke

• 豆角沙拉

• 鱼香酱

• 火锅蘸料

• 照烧汁

• 花生莲藕排骨汤

• 鸡高汤

• 罗宋汤

• 日式鸡蛋三文治

• Omelette

• 温泉蛋

• 伦教糕

• 萝卜糕

• 鸡蛋糕

• 绿豆糕

• 馒头

• 湿炒米粉

• 手工面条 with pasta machine

• 日式面包

• 好喝茶

• 好喝cider

• 绿豆沙

• 手冲咖啡

Personal

Reference

• things needed

• Who am I?

• minimalism

• restaurants recommendations

• Household maintenance

How To

• think about success besides money and company name

Explanation

• note about these notes