Python生成一维码,二维码

原文地址:http://www.codingsoho.com/zh/blog/pythonsheng-cheng-yi-wei-ma-er-wei-ma/

前言

我们的生活已完全离不开一维码和二维码,本文会简单的介绍如果通过python的方法来生成它们

本文环境:

Python 2.7.10

pyBarcode==0.7

Pillow==5.1.0

一维码

安装

pip install pyBarcode

pip install Pillow

生成到文件中

(env) python manage.py shell

Python 2.7.10 (default, May 23 2015, 09:40:32) [MSC v.1500 32 bit (Intel)] on win32

Type "help", "copyright", "credits" or "license" for more information.

(InteractiveConsole)

>>> from barcode.writer import ImageWriter

>>> from barcode.codex import Code39

>>> from PIL import Image, ImageDraw, ImageFont, ImageWin

>>> imagewriter = ImageWriter()

>>> ean = Code39("1234567890", writer=imagewriter, add_checksum=False)

>>> fullname = ean.save('image')

>>> img = Image.open(fullname)

>>> img.show()

首先我们导入Code39,pyBarcode支持多种方式,可用下面命令获取

>>> import barcode

>>> barcode.PROVIDED_BARCODES

['code39', 'ean', 'ean13', 'ean8', 'gs1', 'gtin', 'isbn', 'isbn10', 'isbn13', 'issn', 'jan', 'pzn', 'upc', 'upca']

add_checksum 表示是否将checksum添加到code中

ean.save()参数为文件名,这个文件名可以是绝对路径或者相对路径。

最后,调用了PIL的Image来显示这个生成的图片,如下:

生成到StringIO中

>>> from StringIO import StringIO

>>> i = StringIO()

>>> ean = Code39("0987654321", writer=imagewriter, add_checksum=False)

>>> ean.write(i)

>>> f = StringIO(i.getvalue())

>>> img1 = Image.open(f)

>>> print 'save to StringIO and show with image format'

save to StringIO and show with image format

>>> img1.show()

图片打开时是从StringIO中把内容读出来。

参数配置

从上面图片效果看,文字离一维码距离实在太远了,需要调整一下。差了一下,基本的Writer有下面选项,还有继承类的SVGWritr和ImageWriter等,对我的需要来说,基本的就够了,可以通过调整text_distance和font_size来调整效果

module_width:

The width of one barcode module in mm as float. Defaults to 0.2.

module_height:

The height of the barcode modules in mm as float. Defaults to 15.0.

quiet_zone:

Distance on the left and on the right from the border to the first (last) barcode module in mm as float. Defaults to 6.5.

font_size:

Font size of the text under the barcode in pt as integer. Defaults to 10.

text_distance:

Distance between the barcode and the text under it in mm as float. Defaults to 5.0.

background:

The background color of the created barcode as string. Defaults to white.

foreground:

The foreground and text color of the created barcode as string. Defaults to black.

center_text:

If true (the default) the text is centered under the barcode else left aligned.

有两种方法可以将这个选项参数传递给Writer

All writer take the following options (specified as keyword arguments to Barcode.save(filename, option=value) or set via Writer.set_options(option=value)).

实际使用中,Writer.set_options并没有生效,不确定是否我的方法用错了。

options = {"text_distance":1, "font_size":12}

imagewriter = ImageWriter()

imagewriter.set_options(options=options)

改用Barcode.save方法

options = {"text_distance":1, "font_size":12}

ean = Code39(filename, writer=imagewriter, add_checksum=False)

ean.save(fullpath,options=options)

图片效果如下

详细内容可查看https://pythonhosted.org/pyBarcode/writers/index.html

二维码

安装

pip install qrcode

生成二维码

定义二维码生成函数,将网址放入二维码是常用场景,我们就以这个为例

在qrcode.QRCode初始化函数里,可以定义相应参数,官方资料非常吝啬,下面是网上找到的一些用法

def gen_qrcode(link):
    qr=qrcode.QRCode(
         version = 2,
         error_correction = qrcode.constants.ERROR_CORRECT_L,
         box_size=10,
         border=10,)
    qr.add_data(link)
    qr.make(fit=True)
    img = qr.make_image()
    img.show()

    photopath = os.path.join(settings.MEDIA_ROOT, "test")
    if not os.path.exists(photopath):
        os.makedirs(photopath)
    path = os.path.join(photopath, 'create.jpg')
    img.save(path)
    return path

  

生成的图片如下

三维码

暂时不会,哈哈

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参考文档

pyBarcode 0.7 https://pypi.python.org/pypi/pyBarcode

Pillow-4.2.1 https://pypi.python.org/pypi/Pillow

pywin32 https://pypi.python.org/pypi/pywin32/

https://pycode.readthedocs.io/en/latest/

https://pythonhosted.org/pyBarcode/index.html

python 生成一维码

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转载自www.cnblogs.com/2dogslife/p/8987819.html