qrcode二维码生成库使用详解

二维码简介

• 二维码(百度百科)
• QR Code

qrcode是二维码的一种，可以包含几千个字符。

qrcode使用

pip install qrcode

安装完之后，可以使用命令行工具:

qr "Some text" > test.png

也可以在python中使用qrcode模块:

import qrcode

img = qrcode.make('Some data here')
img.save(r"C:\Users\zzx\Desktop\test.jpg")

使用 QRCode类

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()

version数值从1到40，表示生成二维码的大小

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.

box_size parameter controls how many pixels each “box” of the QR code is.

border parameter controls how many boxes thick the border should be (the default is 4, which is the minimum according to the specs).

This module uses image libraries, Python Imaging Library (PIL) by default, to generate QR Codes.

It is recommended to use the pillow fork rather than PIL itself.

Pilow和PIL不兼容,默认是PIL，当你安装Pillow之后就会卸载PIL

参考文档

• qrcode github README