PyQt5 自定义StatusBar（无法通过ui，只能代码） 摘自stackflow

import sys
from PyQt5.QtWidgets import (QApplication, QMainWindow, QStatusBar, QLabel,
                             QPushButton, QFrame)


class VLine(QFrame):
    # a simple VLine, like the one you get from designer
    def __init__(self):
        super(VLine, self).__init__()
        self.setFrameShape(self.VLine | self.Sunken)


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.statusBar().showMessage("bla-bla bla")
        self.lbl1 = QLabel("Label: ")
        self.lbl1.setStyleSheet('border: 0; color:  blue;')
        self.lbl2 = QLabel("Data : ")
        self.lbl2.setStyleSheet('border: 0; color:  red;')
        ed = QPushButton('StatusBar text')

        # self.statusBar().reformat()
        self.statusBar().setStyleSheet('border: 0; ')
        self.statusBar().setStyleSheet("QStatusBar::item {border: none;}")

        self.statusBar().addPermanentWidget(VLine())  # <---
        self.statusBar().addPermanentWidget(self.lbl1)
        self.statusBar().addPermanentWidget(VLine())  # <---
        self.statusBar().addPermanentWidget(self.lbl2)
        self.statusBar().addPermanentWidget(VLine())  # <---
        self.statusBar().addPermanentWidget(ed)
        self.statusBar().addPermanentWidget(VLine())  # <---

        self.lbl1.setText("Label: Hello")
        self.lbl2.setText("Data : 15-09-2019")

        ed.clicked.connect(lambda: self.statusBar().showMessage("Hello "))


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())

https://stackoverflow.com/questions/57943862/pyqt5-statusbar-separators