Installing the development environment

• Pycharm installation

Download the default installation online

• Python3 installation

Download the default installation online

• PyQt5 installation

Install PyQt5 in Settings –> Project –>Interpreter. Note that version 5.8.2 needs to be installed and packaged as an exe for later PyInstall.

Develop plug-in configuration

• pyqt5

  

  
  

  
  

Program:D:\workspace\python\crossroad\venv\Lib\site-packages\pyqt5_tools\designer.exe

Working directory:$FileDir$

• pyuic

  

  Program:C:\Python\Python37\python.exe
  
  Arguments:-m PyQt5.uic.pyuic $FileName$ -o $FileNameWithoutExtension$.py
  
  Working directory:$FileDir$

• 
  

  
  

• Using pyqt5

  

  
  

• Using pyuic

  

  
  

Developing gadgets

File comparison and replication:

• Requirement: Given two XML files (A and B), nodes in file A need to be copied or replaced into file B. Replacement rule: If the id, name, and type of node attributes are the same, replace the rule, and add the rule if the node attributes are different.

• Implementation scheme: use LXML plug-in to read a, B files, respectively, the two files displayed in the interface QTreeView, the left is the file a to copy, implementation can be selected to copy or new records. On the right is the result file B, which can be deleted.

  

  
  

LXML knowledge

• Read the file

  parserRight = etree.XMLParser(remove_blank_text=True)
  xmlRight = etree.parse(self.rightPath, parserRight)
  self.rightRoot = xmlRight.getroot()  Get the root nodeCopy the code

• Query node

  roadEleList = root.xpath("//OpenDRIVE/road")Copy the code

• Query nodes by properties

  roadEleList = root.xpath("//OpenDriveData/road[@id='" + filterStr + "']")
  ​
  Query by multiple attributes
  objectList = self.rightRoot.xpath(
                      "//OpenDriveData/road[@id='" + roadId + "']/objects/object[@id='" +
                      id + "'and @type='" + type + "' and @name='" + name + "']")Copy the code

• Remove nodes

  objectList = self.rightRoot.xpath(
              "//OpenDriveData/road[@id='" + roadId + "']/objects/object[@id='" +
              id + "'and @type='" + type + "' and @name='" + name + "']")
  rightObjectsList = self.rightRoot.xpath("//OpenDriveData/road[@id='" + roadId + "']/objects # delete objectList[0]. Remove (objectList[0])Copy the code

• The new node

  # Add an existing node
  rightObjectsList[0].append(leftObjectList[0])
  ​
  junction = etree.SubElement(self.root, 'junction', attrib={"id": junctionID})
  links = etree.SubElement(junction, "links")
  link = etree.SubElement(links, "link")
  Etree.SubElement(links, "link", attrib={})
  link.set("type".type)
  link.set("fromroad", fromroad)
  link.set("toroad", toroad)
  link.set("id", id)
  ​
  ​Copy the code

• Save the file

   The node is converted to a tree object
      tree = etree.ElementTree(self.rightRoot)
      ' ''The first parameter is the full path to the XML (including the file name). 2) whether the pretty_print parameter beautificates the code; 3) Whether the xml_declaration parameter is written to the XML declaration, which is the first line of the XML document; 4) The encoding argument is obviously the saved encoding. '' '
      tree.write("b.xml", pretty_print=True, xml_declaration=True, encoding='utf-8')
      QMessageBox.information(self, "Warm reminder"."XML generation successful!", QMessageBox.Yes, QMessageBox.Yes)
  ​
      
  except Exception as err:
      print('Error: {0}'.format(err))
      QMessageBox.information(self, "Warm reminder"."XML generation failed!", QMessageBox.Yes, QMessageBox.Yes)Copy the code

packaging

• Install pyinstall

  

  
  

• Pyinstall command:

  • -f, — onefile packages a single file. Use this if you write all your code in a.py file, but don’t use multiple.py files

  • -d, — onedir packages multiple files and generates many dependency files in DIST, which is suitable for writing tool code in framework form. I personally prefer this, the code is easy to maintain

  • -k, – TK contains TCL/TK at deployment time

  • -a, — ASCII does not contain encoding. All encodings are included by default on Unicode supported Versions of Python.

  • -d, – debug Generates the debug executable file

  • -w, — WINDOwed, — NoConsole executes using the Windows subsystem. Does not open the command line when the program starts (Windows only)

  • – c – nowindowed, – the console

Example: PyInstaller -f -w CrossRoadTool5.py

My path in CMD goes into C:\Python\Python37\Scripts,

Exe -f -w D:\workspace\python\ CrossRoad \FileDiffs.py

• Matters needing attention

  • PyQt5 5.8.2 (tested) or later (not tested) must be installed. The latest pyInstall package error occurs

  • Pycharm pycharm pycharm pycharm pycharm pycharm pycharm pycharm