libqrencode: fast QR code encoding for Python

Fast, robust, and slightly less incomplete cffi-based Python bindings for libqrencode (http://fukuchi.org/works/qrencode/index.en.html).

Python 2, Python 3, and PyPy compatible!

Installing

$ pip install libqrencode-cffi

Examples

>>> import libqrencode as qr
>>> qrc = qr.QRCode("Hello, world!")

# The raw QR code can be accessed, where each item is a bitfield containing
# information about that portion of the code (see DATA_* constants).
>>> qrc.get_raw_data()
[193, 193, 193, 193, ...  3, 2, 2, 3, 3]

# If PIL is installed, a PIL image of the QR code can be created:
>>> qrc.get_im(border=3)
<PIL.Image.Image image mode=L size=81x81 at ...>

# And if lxml.etree / xml.etree is available, an SVG can be generated:
>>> qrc.get_svg_etree()
<Element g at ...>
>>> qrc.get_svg_string()
'<g><rect fill="white" height="21" width="21" x="0" y="0"/>...<rect fill="black" height="1" width="1" x="20" y="19"/></g>'

Constants

Encoding modes (see https://en.wikipedia.org/wiki/QR_code#Encoding):

• MODE_NUL (internal to qrencode)
• MODE_NUM
• MODE_AN
• MODE_8 (default)
• MODE_KANJI
• MODE_STRUCTURE (not fully supported by libqrencode)
• MODE_ECI (not fully supported by libqrencode)
• MODE_FNC1FIRST (not fully supported by libqrencode)
• MODE_FNC1SECOND (not fully supported by libqrencode)

Error correction modes:

• ECLEVEL_L (7%; default)
• ECLEVEL_M (15%)
• ECLEVEL_Q (25%)
• ECLEVEL_H (30%)

Raw data bitmasks:

• DATA_BW (1=black/0=white)
• DATA_DATA_AND_ECC (data and ecc code area)
• DATA_FORMAT_INFO (format information)
• DATA_VERSION_INFO (version information)
• DATA_TIMING_PATTERN (timing pattern)
• DATA_ALIGNMENT_PATTERN (alignment pattern)
• DATA_FINDER_PATTERN (finder pattern and separator)
• DATA_NON_DATA (non-data modules (format, timing, etc.))