添加状态栏（显示状态信息）

效果如下图：

代码：

"""
ZetCode PyQt5 tutorial
This program creates a statusbar.
"""
import sys
from PyQt5.QtWidgets import QMainWindow, QApplication
# The statusbar is created with the help of the QMainWindow widget.


class Example(QMainWindow):

    def __init__(self):
        super().__init__()

        self.initUI()


    def initUI(self):

        # The showMessage() displays a message on the statusbar.
        self.statusBar().showMessage('Ready')

        self.setGeometry(300, 300, 250, 150)
        self.setWindowTitle('Statusbar')
        self.show()


if __name__ == '__main__':

    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())