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：

QtWidgets.png

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_()