应用程序在执行函数时崩溃 Python

当我使用 PyCharm 运行此应用程序时，我很难找出 python 崩溃的原因。我将 url 插入文件 ( https://download.scdn.co/SpotifySetup.exe ) 和保存位置 (D:\)。一旦我按下“下载”，Python 就会停止工作。

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


class Downloader(QDialog):
    def __init__(self):
        QDialog.__init__(self)
        layout = QVBoxLayout()
        url = QLineEdit()
        save_location = QLineEdit()
        progress = QProgressBar()
        download = QPushButton("Download")
        progress.setValue(0)
        progress.setAlignment(Qt.AlignHCenter)

        url.setPlaceholderText("URL")
        save_location.setPlaceholderText("Save folder:")

        layout.addWidget(url)
        layout.addWidget(save_location)
        layout.addWidget(progress)
        layout.addWidget(download)
        self.setLayout(layout)
        self.setWindowTitle("Downloader")
        download.clicked.connect(self.download)

    def download(self):
        url = self.url.text()
        save_location = self.save_location.text()
        urllib.request.urlretrieve(url, save_location, self.report)

        try:
            urllib.request.urlretrieve(url, save_location, self.report)
        except Exception:
            QMessageBox.warning(self, "Warning", "The download failed")
            return

        QMessageBox.information(self, "Information", "The Download is complete")
        self.progress.setValue(0)
        self.url.setText("")
        self.save_location.setText("")


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


app = QApplication(sys.argv)
dl = Downloader()
dl.show()
app.exec_()
sys.exit(app.exec_())