1. QtWidgets应用

import sys
from PySide2.QtWidgets import QApplication, QLabel

app = QApplication(sys.argv)
# A QLabel is a widget that can present text (simple or rich, like html), and images
label = QLabel("<font color=red size=40>Hello World!</font>")
# show the label
label.show()
# enter the Qt main loop and start to execute the Qt code
# In reality, it is only here where the label is shown
app.exec_()

运行结果如下：

2. QtQuick/QML应用

PySide2/QML应用程序至少包含两个不同的文件——一个带有用户界面QML描述的文件，以及一个加载QML文件的Python文件。

• view.qml

  import QtQuick 2.0
  
  Rectangle {
      width: 200
      height: 200
      color: "green"
  
      Text {
          text: "Hello World"
          anchors.centerIn: parent
      }
  }
  

• main.py

  from PySide2.QtWidgets import QApplication
  from PySide2.QtQuick import QQuickView
  from PySide2.QtCore import QUrl
  
  # A PySide2/QML application consists, at least, 
  # of two different files - a file with the QML description of the user interface, 
  # and a python file that loads the QML file. 
  
  app = QApplication([])
  view = QQuickView()
  # import QtQuick and set the source of the QQuickView object to the URL of your QML file
  url = QUrl("./view.qml")
  
  # import QtQuick and set the source of the QQuickView object to the URL of your QML file
  # If you are programming for desktop, you should consider 
  # adding view.setResizeMode(QQuickView.SizeRootObjectToView) before showing the view.
  view.setSource(url)
  # view.setResizeMode(QQuickView.SizeRootObjectToView)
  view.show()
  app.exec_()
  

• 运行结果：

  
  QML.png