安装

python qrcode需要用到PIL和qrcode库，首先安装这些库

pip install qrcode
pip install image

pypi： https://pypi.python.org/pypi/qrcode

二维码生成

简单用法

import qrcode
img = qrcode.make('some data here')
img.save('somedatahere.jpg')
img.show()

高级用法

import qrcode
qr=qrcode.QRCode(
     version = 2,
     error_correction = qrcode.constants.ERROR_CORRECT_L,
     box_size=10,
     border=10,)
qr.add_data('http://zakkabag.applinzi.com/newsletter/')
qr.make(fit=True)
img = qr.make_image()
img.show()
#img.save('test.jpg')

参数解释

The version parameter is an integer from 1 to 40 that controls the size of the QR Code (the smallest, version 1, is a 21x21 matrix). Set to None and use the fit parameter when making the code to determine this automatically.

The 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.

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

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

生成带图案的二维码

生成带图案的二维码会把icon合并要二维码图片中，下面函数能实现该功能

'''
icon size is 1/4
'''
def gen_imge(img, factor = 4, icon = "logo.png"):
    img = img.convert("RGBA")
    icon = Image.open(icon)
    #
    img_w,img_h = img.size    
    size_w = int(img_w / factor)
    size_h = int(img_h / factor)
    #
    icon_w,icon_h = icon.size
    if icon_w >size_w:
        icon_w = size_w
    if icon_h > size_h:
        icon_h = size_h
    icon = icon.resize((icon_w,icon_h),Image.ANTIALIAS)
    #
    w = int((img_w - icon_w)/2)
    h = int((img_h - icon_h)/2)
    icon = icon.convert("RGBA")
    img.paste(icon,(w,h),icon)

    return img

在前面img生成之后，调用还函数叠加logo

import qrcode
from PIL import Image

qr=qrcode.QRCode(
     version = 2,
     error_correction = qrcode.constants.ERROR_CORRECT_H,
     box_size=10,
     border=10,)
qr.add_data('http://zakkabag.applinzi.com/newsletter/')
qr.make(fit=True)
img = qr.make_image()

#add icon to qrcode image
img = gen_imge(img)

img.show()

插入的log

Alt text

生成的图片

Alt text

注意：这种方法是直接用一个图片叠加在生成的二维码图片上，会导致原二维码信息丢失，难以识别。需要将容错参数改为 ERROR_CORRECT_H

二维码解析