前几天，我估摸着做一个能生成QR Code小程序，并能用wxPython在屏幕上显示出来。当然，我想用纯Python实现，观望了一会后，我找到了三个候选：

• python-qrcode on github
• pyqrcode on sourceforge and
• pyqrnative on Google code

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：

原文地址