segno 0.1.5

QR Code and Micro QR Code generator for Python 2 and Python 3

Segno – Python QR Code and Micro QR Code generator

Segno is a QR Code and Micro QR Code generator which has no further dependencies.

This package implements main parts of ISO/IEC 18004:2006(E) / ISO/IEC 18004:2015(E) and produces Micro QR Codes and QR Codes with nearly no effort.

Segno provides several serialization formats like SVG, EPS, PNG, PDF, or text output. None of these serializers require an external lib. Segno provides more serialization formats via a plugin architecture. It was tested against Python 2.6 - 3.4 and PyPy.

Installation

Use pip to install segno from PyPI:

$ pip install segno

Usage

Command line

The command line script prints the QR Code to the terminal:

$ segno "Comfortably Numb"

To serialize the QR Code, use the “output” argument:

$ segno "Famous Blue Raincoat" -o=raincoat.svg
$ segno "Who by Fire" --scale=10 --color=darkblue --border=0 --output=fire.svg
$ segno "Waiting for the Miracle" --scale=10 --background=transparent --output=miracle.png

Library

>>> import segno
>>> qr = segno.make('Up Jumped the Devil')  # Let Segno choose the minimal version
>>> qr.is_micro
False
>>> qr.version
2
>>> qr.error
'M'
>>> qr.save('up-jumped-the-devil.png')  # Save as PNG
>>> qr.save('up-jumped-the-devil-2.png', scale=10)  # Scaling factor 10
>>> qr.save('up-jumped-the-devil-3.png', background=None)  # Transparent background
>>> qr.save('up-jumped-the-devil.pdf', scale=10)  # Save as PDF
>>> # SVG drawing the dark modules in "dark blue"
>>> qr.save('up-jumped-the-devil.svg', scale=10, color='darkblue')

If the content to encode is small enough, a Micro QR Code is generated:

>>> import segno
>>> qr = segno.make('RAIN')
>>> qr.is_micro
True
>>> qr.version
'M2'

If this behaviour is not desired, the user may use the factory functions segno.make_qr() which generates always QR Codes (never Micro QR Codes) or segno.make_micro() which generates always Micro QR Codes (or raises an error if the content is too large for a Micro QR Code).

>>> import segno
>>> mqr = segno.make_micro('THE BEATLES')
>>> mqr.version
'M3'
>>> qr = segno.make_qr('THE BEATLES')  # Same content but enforce a QR Code
>>> qr.version
1
>>> # This won't work since the data does not fit into a Micro QR Code M1 - M4
>>> mqr = segno.make_micro('Nick Cave and the Bad Seeds')
Traceback (most recent call last):
    ...
DataOverflowError: Data too large. No Micro QR Code can handle the provided data

All factory functions use the same parameters to specify the desired error level, version, data mask etc., see Segno’s documentation for details.

Other QR Code generators

• <https://pypi.python.org/pypi/PyQRCode/>

• <https://pypi.python.org/pypi/qrcode/>

• <https://pypi.python.org/pypi/qrcodegen/>

Changes

0.1.5 – 2016-08-24

• Added QRCode.matrix_iter(border) which returns an iterator over the matrix and includes the border (as light modules).

• Invalid (empty) SVG identifiers / class names are ignored and do not result into an invalid SVG document (issue #8).

• SVG serializer: If unit was set to None, an invalid SVG document was generated (issue #14).

• Better command line support:

  • The command line script recognizes all SVG options (#9)

  • Added --mode/-m, renamed --mask/-m to --pattern/-p (issue #10)

  • The script used an empty string as default value for the data to encode. The data to encode has no default value anymore (issue #11)

  • Added --no-ad to omit the comment Software in PNG images (issue #12)

0.1.4 – 2016-08-21

• Better terminal output

• Fixed issue #5: QRCode.terminal() uses a special output function (if it detects Windows) to support MS Windows which may not support ANSI escape codes.

0.1.3 – 2016-08-20

• Added command line script “segno”

• Registered new file extension “ans” which serializes the QR Code as ANSI escape code (same output as QRCode.terminal())

• Removed deprecated methods “eps”, “svg”, “png”, “pdf”, and “txt” from segno.QRCode

• Switched from nose tests to py.test

0.1.2 – 2016-08-17

• Updated docs

• Backwards incompatible change: Deprecated “eps”, “svg”, “png”, “pdf”, and “txt” methods from QRCode. Use QRCode.save. Methods will be removed in 0.1.3

• Fixed issue #3 (M1 and M3 codes may have undefined areas)

• Fixed issue #4 (wrong ‘error’ default value for encoder.encode(), factory function segno.make() wasn’t affected)

0.1.1 – 2016-08-14

• Initial release