import sysfrom PySide2.QtWidgets import (QApplication, QWidget, QVBoxLayout, QPushButton, QLabel, QListWidget, QFileDialog, QMessageBox, QInputDialog)from PySide2.QtGui import QPixmapfrom PyPDF2 import PdfMerger, PdfReader, PdfWriterclass PDFMergerApp(QWidget): def __init__(self): super().__init__() self.init_ui() def init_ui(self): self.s..