def __aggiungi__(self): filelist = filedialog.askopenfilenames(filetypes=[("PDF file",".pdf")]) for file in filelist: if(file in self.files): continue self.i = self.i+1 self.files.append(file) split = file.split("/").pop() self.list_file.insert("",self.i,text=split,values=(PDFMangerFacade.pagescount(file))) self.__controlla__()