Python and Django framework generate two-dimensional code method analysis, pythondjango framework

Python and Django framework generate two-dimensional code method analysis, pythondjango framework

This article describes how to generate a QR code using Python and Django framework. We will share this with you for your reference. The details are as follows:

I. package installation and simple use

1.1 It is very easy to generate a QR code using Python. You can check the qrcode package:

pip install qrcode

Qrcode depends on the Image package:

pip install Image

If this package is difficult to install, you can use a Python-only package to implement this function. See the following.

1.2 after installation, you can use it. This program carries a qr command:

qr 'http://www.ziqiangxuetang.com' > test.png

1.3 let's take a look at how to use it in the code.

import qrcodeimg = qrcode.make('http://www.tuweizhong.com')# img <qrcode.image.pil.PilImage object at 0x1044ed9d0>with open('test.png', 'wb') as f:  img.save(f)

In this way, you can generate a QR code with a URL, but you have to save the file to the hard disk.

[Note]: Use of Python-only packages:

Installation:

pip install git+git://github.com/ojii/pymaging.git#egg=pymagingpip install git+git://github.com/ojii/pymaging-png.git#egg=pymaging-png

The usage is roughly the same, on the command line:

qr --factory=pymaging "Some text" > test.png

Python call:

import qrcodefrom qrcode.image.pure import PymagingImageimg = qrcode.make('Some data here', image_factory=PymagingImage)

2. Use in Django

We can use Django to directly return the generated content to the webpage. the operation procedure is as follows:

2.1 create a zqxtqrcode project, tools application:

django-admin.py startproject zqxtqrcodepython manage.py startapp tools

2.2 Add the tools application to the Project settings. py.

INSTALLED_APPS = (  ...  'tools',)

2.3 modify tools/views. py

from django.http import HttpResponseimport qrcodefrom cStringIO import StringIOdef generate_qrcode(request, data):  img = qrcode.make(data)  buf = StringIO()  img.save(buf)  image_stream = buf.getvalue()  response = HttpResponse(image_stream, content_type="image/png")  response['Last-Modified'] = 'Mon, 27 Apr 2015 02:05:03 GMT'  response['Cache-Control'] = 'max-age=31536000'  return response

After processing the returned results, the browser caches the images and increases the reload speed. For details about Cache-Control and Last-Modified, refer to the HTTP protocol.

2.4 Add the view function to zqxtqrcode/urls. py.

url(r'^qrcode/(.+)$', 'tools.views.generate_qrcode', name='qrcode'),

2.5 synchronize the database and open the Development Server:

python manage.py syncdbpython manage.py runserver

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

PS: here we recommend a QR code online generation tool for your reference:

Online QR code generation tool (enhanced Edition)
Http://tools.jb51.net/transcoding/jb51qrcode