This module uses the Python Imaging Library (PIL) to allow for the generation of QR Codes.

What is a QR Code?

A Quick Response code is a two-dimensional pictographic code used for its fast readability and comparatively large storage capacity. The code consists of black modules arranged in a square pattern on a white background. The information encoded can be made up of any kind of data (e.g., binary, alphanumeric, or Kanji symbols)

Usage

Use the make shortcut function:

import qrcode
img = qrcode.make('Some data here')

Advanced Usage

For more control, use the QRCode class. For example:

import qrcode
qr = qrcode.QRCode(
    version=1,
    error_correction=constants.ERROR_CORRECT_L,
    box_size=10,
)
qr.add_data('Some data')
qr.make(fit=True)

img = qr.make_image()

The version parameter is an integer from 1 to 40 that controls the size of the QR Code (the smallest, version 1, is a 21x21 matrix). Set to None and use the fit parameter when making the code to determine this automatically.

The error_correction parameter controls the error correction used for the QR Code. The following four constants are made available on the qrcode package:

ERROR_CORRECT_L

About 7% or less errors can be corrected.

ERROR_CORRECT_M (default)

About 15% or less errors can be corrected.

ERROR_CORRECT_Q

About 25% or less errors can be corrected.

ERROR_CORRECT_H.

About 30% or less errors can be corrected.

The box_size parameter controls how many pixels each "box" of the QR code is.