在来自回调boto3.s3的QMainWindow中显示进度条

from PyQt5.QtWidgets import QMainWindow, QProgressBar
from PyQt5.QtCore import Qt
import boto3

class MyMainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        
        self.progress_bar = QProgressBar(self)
        self.progress_bar.setGeometry(10, 10, 200, 25)
        self.progress_bar.setValue(0)
        
        self.setCentralWidget(self.progress_bar)

def progress_callback(bytes_transferred, total_bytes):
    progress = int((bytes_transferred / total_bytes) * 100)
    self.progress_bar.setValue(progress)

s3 = boto3.client('s3')

# 示例：上传文件到S3
s3.upload_file('local_file.txt', 'bucket_name', 'remote_file.txt', Callback=progress_callback)

# 示例：从S3下载文件
s3.download_file('bucket_name', 'remote_file.txt', 'local_file.txt', Callback=progress_callback)