从PyQt5最基础的内容开始学习 

import sys

from PyQt5.QtGui import QIcon
from PyQt5.QtWidgets import QWidget, QApplication, QTextBrowser


class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.resize(300, 300)
        self.setWindowTitle('HeadIcon')
        self.setWindowIcon(QIcon('icon.jpg'))

        self.text_browser = QTextBrowser(self)
        self.text_browser.resize(300, 300)
        self.text_browser.setText("Hello World again!")
        self.show()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())

运行结果：