Segno -- Python QR Code and Micro QR Code encoder
Segno (Italian for "sign" / "symbol") is a QR Code and Micro QR Code encoder which has no further dependencies.
This package implements ISO/IEC 18004:2015(E) "QR Code bar code symbology specification" and produces Micro QR Codes and QR Codes with nearly no effort. It supports the Structured Append mode which splits a message across several QR Codes.
Segno provides several serialization formats like Scalable Vector Graphics (SVG), Encapsulated PostScript (EPS), Portable Network Graphics (PNG), Portable Document Format (PDF), Netpbm (PAM, PBM, PPM), LaTeX (PGF/TikZ), X PixMap (XBM), and X Bitmap (XPM) etc. None of these serializers require an external lib. Further, it provides several high level functions to create QR Codes which encode contact data (vCard, MeCard), EPC QR Codes, or WIFI configurations.
The project provides more than 1400 test cases (coverage >= 98%) to verify a standard conform QR Code and Micro QR Code generation acc. to ISO/IEC 18004:2015(E).
Unique features
Pure Python (supports 2.7, 3.7+, PyPy2 and PyPy3)
No dependencies
A lot of serialization formats (SVG, PNG, EPS, PDF, ...)
Micro QR Codes
-
... works also with Micro QR Codes
-
import segno qr = segno.make('Yellow Submarine') qr.save('yellow-submarine.png')
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 -o=raincoat.svg "Famous Blue Raincoat" $ segno --scale 10 --dark darkblue --border 0 --output=fire.svg "Who by Fire" $ segno --scale 10 --light transparent --output=miracle.png "Waiting for the Miracle"
Library
>>> import segno
>>> # Let Segno choose the minimal version and an optimal (maximal) error
>>> # level without changing the minimal version
>>> qr = segno.make('Up Jumped the Devil')
>>> qr.designator # Returns the QR Code version and the error correction level
'2-Q'
>>> 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', light=None) # Transparent light modules
>>> 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, dark='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.designator
'M2-M'
If this behaviour is not desired, the user may set micro
to False
>>> import segno
>>> qr = segno.make('RAIN', micro=False)
>>> qr.is_micro
False
>>> qr.designator
'1-H'
Or use the factory functions segno.make_qr()
which generates always QR Codes
(never Micro QR Codes) or segno.make_micro()
which returns 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.designator
'M3-M'
>>> qr = segno.make_qr('THE BEATLES') # Same content but enforce a QR Code
>>> qr.designator
'1-Q'
>>> # 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.
Documentation
Read the online documentation at <https://segno.readthedocs.io/>
Trademark
"QR Code" and "Micro QR Code" are registered trademarks of DENSO WAVE INCORPORATED.