def action(self):
        """copy files"""
        
        fromPath = self.txtFrom.text()                         
        size = 0
        for root, dirs, files in os.walk(fromPath):       
            if len(files):
                for file in files:
                    filePath = os.path.join(root, file)   
                    size = size + os.stat(filePath)[6]    
        self.pBar.setMinimum(0)                           
        self.pBar.setMaximum(size)                        
        
        
        sizeCopy = 0 
        for root, dirs, files in os.walk(fromPath):
          if len(files):
                for file in files:
                    filePath = os.path.join(root, file)
                    sizeCopy = sizeCopy + os.stat(filePath)[6]
                    try:
                        shutil.copy2(filePath, self.txtTo.text())
                        self.pBar.setValue(sizeCopy)
                    except:
                        continue