Title: QR code generator
Technical implementation: The web-app uses Flask, Pillow for image manipulation, and for the QR code processes (encoding, matrix generation) the libraries qrcode and segno.
Description: I kept this simple, since I wanted to write a "Pythonic" app. The implementation works well, the UI is clean, it scales, the QR codes can be updated/downloaded, and the user sees the changes in real-time. The application is designed to be web-based, and it is supposed to touch on the following points:
- I followed strict implementation rules, with extensive (in-code) documentation notes/comments.
- I did some "lazy code writing," meaning that I left most of the heavy work to be done by the libraries. For example, what I mean by that is: for the QR code version, I let the library do the matrix search and match (1..40). So I did not explicitly define the version (manually); if you see in the code, initially, I had the version defined, and later I decided to comment it out and use the automatic assignment. What I did was set the version to “None” and called qrcode.make(fit=True) => the version is picked automatically, and potential DataOverflow errors are avoided.
- The UI is minimal, but the QR code generation, editing, and download work, as indicated by the listed options.
- On the SVG side, it was initially set to be displayed via an iframe, which would visually cause issues or misalignment => I switched to an image type of tag (mainly because this is a pretty static application and dynamic behavior was not expected nor needed here).