Specify a file path from QFileDialog as another argument in QProcess?

Hello everyone! I would like to have a possibility to start and stop an imported file that contains a running loop (in fact, it contains a Python “threading” inside a while-loop). This imported file in turn requires input data/files. Here is a reproducible code:

from PyQt5.QtWidgets import (QApplication, QMainWindow, QPushButton, QPlainTextEdit,QVBoxLayout, QWidget, QProgressBar, QFileDialog)
from PyQt5.QtCore import QProcess
import sys
import re

progress_re = re.compile("Total complete: (\d+)%")

def simple_percent_parser(output):
    m = progress_re.search(output)
    if m:
        pc_complete = m.group(1)
        return int(pc_complete)


class MainWindow(QMainWindow):

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

        self.p = None

        self.btn = QPushButton("Execute")
        self.btn.pressed.connect(self.start_process)

        self.btn1 = QPushButton("Stop")
        self.btn1.pressed.connect(self.stop_process)

        self.dButton = QPushButton("Select a File")
        self.dButton.clicked.connect(self.getfile)


        self.text = QPlainTextEdit()
        self.text.setReadOnly(True)

        self.progress = QProgressBar()
        self.progress.setRange(0, 100)

        l = QVBoxLayout()
        l.addWidget(self.btn)
        l.addWidget(self.btn1)
        l.addWidget(self.dButton)
        l.addWidget(self.text)

        w = QWidget()
        w.setLayout(l)

        self.setCentralWidget(w)

    def message(self, s):
        self.text.appendPlainText(s)

    def start_process(self):
        if self.p is None:
            self.message("Executing process")
            self.p = QProcess()
            self.p.readyReadStandardOutput.connect(self.handle_stdout)
            self.p.readyReadStandardError.connect(self.handle_stderr)
            self.p.finished.connect(self.process_finished)
            self.p.start("python", ['dummy_script2.py'])

    def handle_stderr(self):
        data = self.p.readAllStandardError()
        stderr = bytes(data).decode("utf8")
        progress = simple_percent_parser(stderr)
        if progress:
            self.progress.setValue(progress)
        self.message(stderr)

    def handle_stdout(self):
        data = self.p.readAllStandardOutput()
        stdout = bytes(data).decode("utf8")
        self.message(stdout)

    def process_finished(self):
        self.message("Process finished.")
        self.p = None

    def stop_process(self):
        self.message("Process finished.")
        self.p = None


    def getfile(self):
        # global fileName
        filename = QFileDialog.getOpenFileName()
        fileName = filename[0]
        return fileName


app = QApplication(sys.argv)

w = MainWindow()
w.show()

app.exec_()

dummy_script2.py:

import time 


def run(filePath):
    count =0
    while True:
        count = count + 1
        print(count)
        print(filePath)
        time.sleep(1)


run(filePath)

So, I have no problem running the imported file (if it doesn’t require input) and getting the file path from QFileDialog. But I have a problem passing the path to that file. I will appreciate any tips and help!