old_contents: #!/usr/bin/python3
  
  from PyQt5 import QtCore, QtGui, QtWidgets
  import ui
  
  class Ui_window(ui.Ui_main_window):
  
  
      # Add list of Serial Port to serial_port object of Combo Box
      def add_serial_port(self, list_serial):
          # Add it
          self.serial_port.addItems(list_serial)
  
      # Add list of Baud rate to baud_rate object of Combo Box
      def add_baud_rate(self, list_baud):
          # cause value of baud rate list are integer we have
          # to include it to string in ui
          for list in list_baud:
              self.baud_rate.addItem(str(list))
  
      # Add list of Stop Bits (Argument is Dictionary) to Combo Box
      def add_stop_bits(self, dict):
          self.stop_bits.addItems(list(dict.keys()))
  
      # Unlcok Advanced option by Check Box
      def unlock_advanced_option(self):
  
          # Make it all Enabled
          if self.checkBox.isChecked() is not False:
              self.stop_bits.setEnabled(True)
              self.parity_check.setEnabled(True)
              self.bytesize.setEnabled(True)
          # if unchecked disable it all
          elif self.checkBox.isChecked() is not True:
              self.stop_bits.setEnabled(False)
              self.parity_check.setEnabled(False)
              self.bytesize.setEnabled(False)
new_contents: #!/usr/bin/python3
  
  from PyQt5 import QtCore, QtGui, QtWidgets
  import ui
  
  class Ui_window(ui.Ui_main_window):
  
      def __init__(self,main_window):
          super().__init__(main_window)
  
      # Add list of Serial Port to serial_port object of Combo Box
      def add_serial_port(self, list_serial):
          # Add it
          self.serial_port.addItems(list_serial)
  
      # Add list of Baud rate to baud_rate object of Combo Box
      def add_baud_rate(self, list_baud):
          # cause value of baud rate list are integer we have
          # to include it to string in ui
          for list in list_baud:
              self.baud_rate.addItem(str(list))
  
      # Add list of Stop Bits (Argument is Dictionary) to Combo Box
      def add_stop_bits(self, dict):
          self.stop_bits.addItems(list(dict.keys()))
  
      # Unlcok Advanced option by Check Box
      def unlock_advanced_option(self):
  
          # Make it all Enabled
          if self.checkBox.isChecked() is not False:
              self.stop_bits.setEnabled(True)
              self.parity_check.setEnabled(True)
              self.bytesize.setEnabled(True)
          # if unchecked disable it all
          elif self.checkBox.isChecked() is not True:
              self.stop_bits.setEnabled(False)
              self.parity_check.setEnabled(False)
              self.bytesize.setEnabled(False)
subject: Add Constructor