如何打开另一个pyqt gui并从中获取价值？

Question

I am working on developing a file selection dialog using Python 3.6 and pyqt5. The basic idea of the dialog is that it has the option to preview files before selecting. It can preview any kinds of registered windows files. The design was done using QtDesigner MainWindow. Now I can open this preview file browser from another pyqt/python3 file. But how can I retrieve the selected filename and file path from that script? Here is the test file where I am opening the preview browser file:

class TestBrowser(QtWidgets.QMainWindow, design.Ui_MainWindow):
    def __init__(self,browser):
        super(self.__class__, self).__init__()
        self.setupUi(self)  # This is defined in design.py file automatically
        # It sets up layout and widgets that are defined
        self.browser=browser
        self.pushButton.clicked.connect(self.dario)

    def dario(self):
        self.browser.exec_()

def main():
    app = QApplication(sys.argv)
    browser=bd.BrowserDialog()
    main=TestBrowser(browser)
    main.show()
    sys.exit(app.exec_())

if __name__ == '__main__':    # if we're running file directly and not importing it
    main()

Answer 1

I personally use globals on a different .py file (for sanity purposes) for stuff like this when I get stuck on "how can I move a value from another class/function/something".

On new .py file:

file_name = None
file_path = None

# Save function
def save_filename(selected_file, selected_path):
    global file_name, file_path
    file_name = selected_file
    file_path = selected_path

And on your browser when you select a file, add:

mynewpyfile.save_filename(file, path)

Then from your main window you can get the file data as:

self.pushTestbutton.clicked.connect(self.do_something)

def do_something(self):
    print("the selected file is" + mynewpyfile.file_path + "/" + mynewpyfile.file_name)

Other alternatives: http://doc.qt.io/qt-5/qfiledialog.html
In this approach you just add a QlineEdit and... athough limited, it can't be easier than this.

self.lineTest.setText(QtWidgets.QFileDialog.getOpenFileName()[0])