tutorial tag description
View All Tags
Gone are the days of boring black-and-white squares! With the advent of advanced AI image generation models like Stable Diffusion, we can now create QR codes that are not only scannable but are also stunning works of art. This guide will walk you through the process of generating stylized QR codes that seamlessly blend into captivating images.
If you print 1,000 posters with a QR code and the website URL changes next week, a "Static" QR code becomes a pile of wasted paper. The solution is a Dynamic QR code.
Instead of encoding your final destination (like myshop.com/promo-january), you encode a "Short URL" that you control (like myqr.link/offer). When a user scans it, your server looks up where offer should go today and redirects them instantly.
Exporting your scan data is the final piece of the puzzle. While a database is great for storage, most team members prefer to see results in a spreadsheet.
In Python, the pandas library is the gold standard for this. It can read directly from your SQLite database and convert that data into a professional-looking Excel or CSV file in just a few lines of code.
Connecting your scanner to a database transforms a simple visual tool into a functional Inventory Management or Attendance System. In this walkthrough, we will use SQLite because it is built into Python, requires no external server setup, and is perfect for edge devices like a Raspberry Pi or a local laptop.
Building a code generator is only half the battle. In this walkthrough, we will build a high-performance scanning system capable of identifying and decoding multiple barcodes and 2D codes (QR, Data Matrix, etc.) from both static images and real-time video streams.
While QR codes are great for marketing and consumers, industrial and government applications often require formats that are either more compact or hold significantly more data. This article covers how to generate Data Matrix (popular in healthcare and aerospace) and PDF417 (the standard for ID cards and shipping) using Python.
Generating barcodes is a surprisingly simple task in Python thanks to a few highly specialized libraries. Whether you're building an inventory system, a ticketing app, or a simple tracking tool, Python can generate industry-standard barcodes in just a few lines of code.
The most popular and robust library for this task is python-barcode.
The AttributeError is one of the most common exceptions in Python, indicating an attempt to access or set a class attribute that simply doesn't exist. When it occurs within the context of a @dataclass, it often points to a misunderstanding of how the decorator automatically generates methods like __init__ and __setattr__.
Here is a breakdown of the most frequent AttributeError scenarios involving dataclasses and the high-level solutions to resolve them.