Introduction

This is a library that help us to generate a QR Code

1. pypi
2. Github

Installation

pip install qrcode

Usage

There are several ways to generate the QR codes:

• Command Line.
• Basic Use.
• Advance Use.

Commands

The simple way to generate the code will be using command line.

qr "some text" > test.png

Basic Use

we can use a short code make:

import qrcode
img = qrcode.make("some data here")

Advance Use

We can we more control if we use the QRCode Class

import qrcode

qr = qrcode.QRCode(
    version=1,
    error_correction=qrcode.constants.ERROR_CORRECT_L,
    box_size=10,
    border=4,)
qr.add_data('same data')
qr.make(fit=True)

img = qr.make_image(fill_color="black", back_color="white")

Now from the code we have:

1. version it is a integer from 1 to 40 it control the sizes smallest been the version 1, or a matrix \(21X21\), we can set it to None and later use fit parameter to determine the size automatically.
2. fill_color and back_color it can change the color of the background and the painting color of the QR.
3. box_size controls how many pixels each "box" of the QR Code is.
4. border Controls how many boxes thick the border should be ( default 4, which is the maximum).

error_correction

This parameter control the error correction use for the QR Code, it has four possible constant values:

• ERROR_CORRECT_L: 7% or less errors can be corrected.
• ERROR_CORRECT_M: (default) 15% or less errors can be corrected.
• ERROR_CORRECT_Q: 25% or less error can be corrected.
• ERROR_CORRECT_H: 30% or less error can be corrected.