file_browser.py

import sys
import os

from PyQt5.Qt import *  # noqa


def main():
    class Foo(QMainWindow):

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

            self.model_files = QFileSystemModel(self)
            self.model_files.setFilter(QDir.Files)

            self.file_view = QTableView()
            self.file_view.setModel(self.model_files)
            self.setCentralWidget(self.file_view)

            self.timer = QTimer.singleShot(2000, lambda: self.first(os.getcwd()))
            self.timer = QTimer.singleShot(4000, lambda: self.first(os.path.join(os.getcwd(), '..')))

        def first(self, path):
            basedir = os.path.dirname(path) if os.path.isfile(path) else path
            index = self.model_files.setRootPath(str(basedir))
            self.file_view.setRootIndex(index)


    app = QApplication(sys.argv)
    foo = Foo()
    foo.setMinimumSize(1024, 480)
    foo.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()