github 上的 python-qrcode
sourceforge上的 pyqrcode
Goolge code 上的 pyqrnative

我尝试了python-qrcode以及pyqrnative，因为它们能够运行在Windows/Mac/Linux。也不需要依赖额外的其他库除了Python图像库。pyqrcode项目需要其他一些先决条件，并且不能在Windows上运行，所以我不想与之纠缠了。我最后使用了一些以前写过的一个Photo Viewer程序的代码，然后稍微地修改了一下，就成了QRCode的查看器了。

开始

正如我上面提到的，你只需要Python图像库，GUI部分我们将使用wxPython。python-qrcode相比pyqrnative生成图片更快，并包含了你见过的大多数QR码类型。

生成 QR Codes

当你准备好所有需要的以后，你可以运行以下代码，看看Python做了些啥：

import os
import wx
 
try:
 import qrcode
except ImportError:
 qrcode = None
 
try:
 import PyQRNative
except ImportError:
 PyQRNative = None
 
########################################################################
class QRPanel(wx.Panel):
 """"""
 
 #----------------------------------------------------------------------
 def __init__(self, parent):
 """Constructor"""
 wx.Panel.__init__(self, parent=parent)
 self.photo_max_size = 240
 sp = wx.StandardPaths.Get()
 self.defaultLocation = sp.GetDocumentsDir()
 
 img = wx.EmptyImage(240,240)
 self.imageCtrl = wx.StaticBitmap(self, wx.ID_ANY,
 wx.BitmapFromImage(img))
 
 qrDataLbl = wx.StaticText(self, label="Text to turn into QR Code:")
 self.qrDataTxt = wx.TextCtrl(self, value="http://www.mousevspython.com", size=(200,-1))
 instructions = "Name QR image file"
 instructLbl = wx.StaticText(self, label=instructions)
 self.qrPhotoTxt = wx.TextCtrl(self, size=(200,-1))
 browseBtn = wx.Button(self, label='Change Save Location')
 browseBtn.Bind(wx.EVT_BUTTON, self.onBrowse)
 defLbl = "Default save location: " + self.defaultLocation
 self.defaultLocationLbl = wx.StaticText(self, label=defLbl)
 
 qrcodeBtn = wx.Button(self, label="Create QR with qrcode")
 qrcodeBtn.Bind(wx.EVT_BUTTON, self.onUseQrcode)
 pyQRNativeBtn = wx.Button(self, label="Create QR with PyQRNative")
 pyQRNativeBtn.Bind(wx.EVT_BUTTON, self.onUsePyQR)
 
 # Create sizer
 self.mainSizer = wx.BoxSizer(wx.VERTICAL)
 qrDataSizer = wx.BoxSizer(wx.HORIZONTAL)
 locationSizer = wx.BoxSizer(wx.HORIZONTAL)
 qrBtnSizer = wx.BoxSizer(wx.VERTICAL)
 
 qrDataSizer.Add(qrDataLbl, 0, wx.ALL, 5)
 qrDataSizer.Add(self.qrDataTxt, 1, wx.ALL|wx.EXPAND, 5)
 self.mainSizer.Add(wx.StaticLine(self, wx.ID_ANY),
 0, wx.ALL|wx.EXPAND, 5)
 self.mainSizer.Add(qrDataSizer, 0, wx.EXPAND)
 self.mainSizer.Add(self.imageCtrl, 0, wx.ALL, 5)
 locationSizer.Add(instructLbl, 0, wx.ALL, 5)
 locationSizer.Add(self.qrPhotoTxt, 0, wx.ALL, 5)
 locationSizer.Add(browseBtn, 0, wx.ALL, 5)
 self.mainSizer.Add(locationSizer, 0, wx.ALL, 5)
 self.mainSizer.Add(self.defaultLocationLbl, 0, wx.ALL, 5)
 
 qrBtnSizer.Add(qrcodeBtn, 0, wx.ALL, 5)
 qrBtnSizer.Add(pyQRNativeBtn, 0, wx.ALL, 5)
 self.mainSizer.Add(qrBtnSizer, 0, wx.ALL|wx.CENTER, 10)
 
 self.SetSizer(self.mainSizer)
 self.Layout()
 
 #----------------------------------------------------------------------
 def onBrowse(self, event):
 """"""
 dlg = wx.DirDialog(self, "Choose a directory:",
 style=wx.DD_DEFAULT_STYLE)
 if dlg.ShowModal() == wx.ID_OK:
 path = dlg.GetPath()
 self.defaultLocation = path
 self.defaultLocationLbl.SetLabel("Save location: %s" % path)
 dlg.Destroy()
 
 #----------------------------------------------------------------------
 def onUseQrcode(self, event):
 """
 https://github.com/lincolnloop/python-qrcode
 """
 qr = qrcode.QRCode(version=1, box_size=10, border=4)
 qr.add_data(self.qrDataTxt.GetValue())
 qr.make(fit=True)
 x = qr.make_image()
 
 qr_file = os.path.join(self.defaultLocation, self.qrPhotoTxt.GetValue() + ".jpg")
 img_file = open(qr_file, 'wb')
 x.save(img_file, 'JPEG')
 img_file.close()
 self.showQRCode(qr_file)
 
 #----------------------------------------------------------------------
 def onUsePyQR(self, event):
 """

http://code.google.com/p/pyqrnative/

 """
 qr = PyQRNative.QRCode(20, PyQRNative.QRErrorCorrectLevel.L)
 qr.addData(self.qrDataTxt.GetValue())
 qr.make()
 im = qr.makeImage()
 
 qr_file = os.path.join(self.defaultLocation, self.qrPhotoTxt.GetValue() + ".jpg")
 img_file = open(qr_file, 'wb')
 im.save(img_file, 'JPEG')
 img_file.close()
 self.showQRCode(qr_file)
 
 #----------------------------------------------------------------------
 def showQRCode(self, filepath):
 """"""
 img = wx.Image(filepath, wx.BITMAP_TYPE_ANY)
 # scale the image, preserving the aspect ratio
 W = img.GetWidth()
 H = img.GetHeight()
 if W > H:
 NewW = self.photo_max_size
 NewH = self.photo_max_size * H / W
 else:
 NewH = self.photo_max_size
 NewW = self.photo_max_size * W / H
 img = img.Scale(NewW,NewH)
 
 self.imageCtrl.SetBitmap(wx.BitmapFromImage(img))
 self.Refresh()
 
 
########################################################################
class QRFrame(wx.Frame):
 """"""
 
 #----------------------------------------------------------------------
 def __init__(self):
 """Constructor"""
 wx.Frame.__init__(self, None, title="QR Code Viewer", size=(550,500))
 panel = QRPanel(self)
 
if __name__ == "__main__":
 app = wx.App(False)
 frame = QRFrame()
 frame.Show()
 app.MainLoop()

python-qrcode生成效果图：

PyQRNative生成效果图：