text: from PyQt5.QtGui import QPixmap
  from PyQt5.QtWidgets import (QWidget, QLabel, QLineEdit,
                               QTextEdit, QGridLayout, QApplication, QFileDialog)
  from PyQt5 import QtWidgets
  from PyQt5.QtCore import Qt
  from PyQt5.QtWidgets import QApplication
  from vtk.qt.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor
  import sys
  import gui_settings
  import vtk
  from util import createLine
  
  from PyQt5.QtWidgets import QApplication, QMainWindow
  
  if __name__ == '__main__':
      app = QApplication(sys.argv)
      MainWindow = QMainWindow()
  
      ui = gui_settings.Ui_MainWindow()
      ui.setupUi(MainWindow)
  
      MainWindow.show()
      sys.exit(app.exec_())
  
  