Как зациклить функцию

import sys
from conv import *
from PyQt5.QtWidgets import QTableWidgetItem
 
 
import math
 
from PyQt5 import QtWidgets
from PyQt5.QtWidgets import QComboBox
from PyQt5.QtGui import QPixmap
 
class MyWin(QtWidgets.QMainWindow, QComboBox, QPixmap ):
    def __init__(self, parent = None):
        QtWidgets.QWidget.__init__(self, parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        self.ui.comboBox.addItems(["_____", "Celsius_temperature","Fahrenheit_temperature",
        "Kelvin_temperature","Reaumur_temperature"])
        self.ui.comboBox.activated[str].connect(self.Activated)
        '''
        self.ui.comboBox_3.addItems(["Pascal"])
        self.ui.comboBox_3.activated[str].connect(self.Activated1)
'''
 
 
    def Activated(self, datatxt):
        getattr(self, "{0}".format(datatxt))()
 
    def _____(self):
        pass
 
    def Celsius_temperature(self):
        try:
            t = float(self.ui.lineEdit_5.text().replace(',', '.'))
 
            C = t
            F = (t*1.8)+32.0
            K = t + 273.15
            Re = t * 0.8
 
            self.ui.lineEdit.setText(str(round(C,2)))
            self.ui.lineEdit_2.setText(str(round(F,2)))
            self.ui.lineEdit_3.setText(str(round(K,2)))
            self.ui.lineEdit_4.setText(str(round(Re,2)))
        except:
            pass
if __name__ == "__main__" :
    app = QtWidgets.QApplication(sys.argv)
    myapp = MyWin()
    myapp.show()
    sys.exit(app.exec_())

import sys
from i import *
from PyQt5.QtWidgets import QTableWidgetItem
 
import math
 
from PyQt5 import QtWidgets
from PyQt5.QtWidgets import QComboBox
from PyQt5.QtGui import QPixmap
 
 
class MyWin(QtWidgets.QMainWindow, QComboBox, QPixmap):
    def __init__(self, parent=None):
        QtWidgets.QWidget.__init__(self, parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        self.ui.lineEdit.textChanged['QString'].connect(self.do_some)
 
    def do_some(self):
        try:
            if self.lineEdit != '':
                lenght = int(self.ui.lineEdit.text())
                double = lenght * lenght
                self.ui.lineEdit_2.setText(str(double))
                self.ui.label.setText(str(double))
        except:
            pass
 
 
if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    myapp = MyWin()
    myapp.show()
    sys.exit(app.exec_())