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How to install qrcode
- Download and install ActivePython
- Open Command Prompt
- Type
pypm install qrcode
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This module uses image libraries, Python Imaging Library (PIL) by default, 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
From the command line, use the installed qr script:
qr "Some text" > test.png
Or in Python, 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=qrcode.constants.ERROR_CORRECT_L,
box_size=10,
border=4,
)
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.
The border parameter controls how many boxes thick the border should be (the default is 4, which is the minimum according to the specs).
Other image factories
You can encode as SVG, or use a new pure Python image processor to encode to PNG images.
The Python examples below use the make shortcut. The same image_factory keyword argument is a valid option for the QRCode class for more advanced usage.
SVG
On Python 2.6 must install lxml since the older xml.etree.ElementTree version can not be used to create SVG images.
You can create the entire SVG or an SVG fragment. When building an entire SVG image, you can use the factory that combines as a path (recommended, and default for the script) or a factory that creates a simple set of rectangles.
From your command line:
qr --factory=svg-path "Some text" > test.svg qr --factory=svg "Some text" > test.svg qr --factory=svg-fragment "Some text" > test.svg
Or in Python:
import qrcode
import qrcode.image.svg
if method == 'basic':
# Simple factory, just a set of rects.
factory = qrcode.image.svg.SvgImage
elif method == 'fragment':
# Fragment factory (also just a set of rects)
factory = qrcode.image.svg.SvgFragmentImage
else:
# Combined path factory, fixes white space that may occur when zooming
factory = qrcode.image.svg.SvgPathImage
img = qrcode.make('Some data here', image_factory=factory)
Two other related factories are available that work the same, but also fill the background of the SVG with white:
qrcode.image.svg.SvgFillImage qrcode.image.svg.SvgPathFillImage
Pure Python PNG
Install the following two packages:
pip install git+git://github.com/ojii/pymaging.git#egg=pymaging pip install git+git://github.com/ojii/pymaging-png.git#egg=pymaging-png
From your command line:
qr --factory=pymaging "Some text" > test.png
Or in Python:
import qrcode
from qrcode.image.pure import PymagingImage
img = qrcode.make('Some data here', image_factory=PymagingImage)
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