[qt5] file dialog

file_dialog.py

import sys
from PyQt5.QtWidgets import (QMainWindow, QTextEdit,
                             QAction, QFileDialog, QApplication)
from PyQt5.QtGui import QIcon


class Example(QMainWindow):
    def __init__(self):
        super().__init__()
        self.init_ui()

    def init_ui(self):
        self.text_edit = QTextEdit()
        self.setCentralWidget(self.text_edit)
        self.statusBar()

        open_file = QAction(QIcon('open.png'), '&Open', self)
        open_file.setShortcut('Ctrl+O')
        open_file.setStatusTip('Open new file')
        open_file.triggered.connect(self.show_dialog)

        menu_bar = self.menuBar()
        file_menu = menu_bar.addMenu('&File')
        file_menu.addAction(open_file)

        self.setGeometry(300, 300, 350, 300)
        self.setWindowTitle('File dialog')
        self.show()

    def show_dialog(self):
        file_name = QFileDialog.getOpenFileName(self, 'Open file', '/home')[0]
        f = open(str(file_name), 'r')

        with f:
            data = f.read()
            self.text_edit.setText(data)


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