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Here is an overview in English of the Japanese blog article: "The blog article introduces a PHP function that checks if a given JAN code is valid. If the JAN code is valid, the function returns true; if it is invalid, it returns false and an error message."

Fix `npm install fibers` (node-fibers) failing with `ValueError: invalid mode: 'rU'` — its `setup.py` uses a deprecated flag, so install with Python 3.10 or older.

Step-by-step guide to the OpenAI ChatGPT API: account, credit card, billing limit, and API key issuance, with screenshots.

Confirm the 'Editing in progress' state when modifying a Mezzanine BlogPost — how to check locks and edit state in the Admin.

Configure a macOS Service (Quick Action) that copies the absolute path of the file or folder open in Finder to the clipboard.

Here's an overview of a blog post detailing how to view the standard output of a serial console connected to a Mac. This method is useful when you need to monitor the output from CircuitPython, among other uses.

Here's an example to illustrate how docker-compose commands can fail and produce confusing error messages if the arguments are not provided in the correct order.

Glossary of real-time pub/sub protocols (MQTT/STOMP/Redis Pub-Sub) and a comparison of Python clients to connect to each.

Workaround for `copy: input/output error` writing files to a Raspberry Pi Pico (RP2040) from macOS Sonoma.

Flash CircuitPython onto an ESP32 dev board (HW-394 / WROOM-32) and drive I/O in Python — bootloader mode and REPL connection.

With applications like iTerm2, you can make a link text open a different URL by Command + clicking, similar to how the a tag works in HTML.

This article explains how to directly view the contents of Django Redis using the Django shell.

When connecting to an SSH server using Python libraries like Fabric or Paramiko, if the versions are outdated, you may encounter the error "Authentication (publickey) failed."

I recently realized that I can rotate backup files (by deleting old files) every few days by sharding the sequential day numbers, which increase by one each day, using modulo 10. Here's the method I've been using lately.

Set up an HTTP proxy to another service's API in Nuxt 3 (Nitro) — the simple `routeRules.proxy` pattern.

I usually write data copy scripts in bash, but I tried writing one in Python this time and decided to document it.

Python script to copy AWS RDS MySQL data from production to a dev environment fast — table-level `mysqldump` + `mysql` piping.

Here's an overview of the blog post in English: --- This blog post introduces a function to obtain a datetime N months ago, without using the `dateutil` library. The function was created because `dateutil` was not available in the Python Data Source for Re:dash. ---

During an IT audit, it was necessary to represent the scale of the application. To achieve this, I decided to consider the total number of URLs in Django as an indicator of the application's scale.

I wrote a script to download the version of chromedriver that matches the currently installed version of Chrome.