اولین برنامه پایتون

from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
import urllib.request
import sys


class Window(QWidget):
    def __init__(self):
        QWidget.__init__(self)

        self.setWindowTitle("Amir Downloader")
        layout = QVBoxLayout()
        self.setLayout(layout)
        self.url = QLineEdit()
        self.url.setPlaceholderText("Enter URL")
        layout.addWidget(self.url)
        self.path = QLineEdit()
        self.path.setPlaceholderText("Enter save path")
        layout.addWidget(self.path)
        self.progres = QProgressBar()
        layout.addWidget(self.progres)
        self.progres.setValue(0)
        self.progres.setAlignment(Qt.AlignHCenter)
        button = QPushButton("Download")
        layout.addWidget(button)
        self.label = QLabel('url demo')
        self.label2 = QLabel('path demo')
        layout.addWidget(self.label)
        layout.addWidget(self.label2)

        button.clicked.connect(self.download)

    def download(self):
        url = self.url.text()
        path = self.path.text()
        self.label.setText(url)
        self.label2.setText(path)
        urllib.request.urlretrieve(url, path , self.report)

    def report(self, blocknum, blocksize, totalsize):
        readsofar = blocknum * blocksize
        if totalsize > 0:
            percent = readsofar * 100 / totalsize
            self.progres.setValue(int(percent))


app = QApplication(sys.argv)
screen = Window()
screen.show()
sys.exit(app.exec_())