Qrcode Download File
Sibila Tellio
Since we setup python-qrcode about five months ago, every single qrcode we have generated has been exactly the same size without fail. However, we've now pushed everything through to a production server and suddenly we have a problem.
On my local machine and on our dev server, all the qrcodes are exactly the same size (including the one with the extra characters), but on the production server, the longer one is bigger while the other is correct.
After a lengthy discussion it was established that the two servers used different URLs. The one that spewed out a larger QR code (in terms of QR pixels, and subsequently in terms of image pixels) overflowed, where the limit of bits it could store for the predefined size was not enough, and qrcode made it fit by increasing the amount of data it could store.
For those (using Pycharm) having problem with "import qrcode" "ModuleNotFoundError: No module named 'qrcode'".After "pip install qrcode" at command prompt, you also need to install "package" name qrcode in Pycharm too.File -> Settings -> Project:#### -> Python Interpreter -> "+" -> search "qrcode" -> Press "Install Package"
In the qrcode package only the binary (byte sequence) mode is implemented. Therefore it is not possible to express very long numbers or strings within a single QR code, while this would be possible if the full standard with all the modes was implemented. Of course it is still possible to encode numbers or strings or Kanji using the binary mode, but the maximum size is a bit smaller.
As an example: for a QR code of level 5 (37x37 pixels) with medium level error correction (which is the default for the qrcode package) using modes you can store numbers of length 202, strings of length 122 and byte sequences of length 84. Using the qrcode package this means that the maximum length of numbers and strings will also be 84 instead of 202/122.
Considering the second limitation: if you want to encode input that does not fit in a single QR code, then the official standard allows to split the input over multiple QR codes, which should be scanned one after the other and then combined by the reader to restore the original input. However, the qrcode package does not implement this feature. This means that if you have long input that you want to encode then you cannot use the package (or split the input yourself before creating QR codes and combining it afterwards).
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