Преобразование PyQt5 TimeEdit в формат даты и времени Python 3.7

Question

У меня есть простая программа, рассчитывающая рабочее время с помощью функции datetime. Теперь я пытаюсь преобразовать это в приложение PyQt5. Я пытаюсь использовать функцию TimeEdit в качестве ввода для времени начала, окончания и обеда. Моя проблема в том, как преобразовать значения Qtime в значения datetime, из которых я могу вычислить timedelta. Я пробовал функции toPyDateTime() и toPython(), но получаю такие ошибки, как: объект "QTime" не имеет атрибута "toPython". Я гуглил часами, но не нашел решения. И да, я новичок в Python и Stackru, поэтому, пожалуйста, не будьте слишком суровы со мной.

Мое приложение cli:

from datetime import *
from re import *

pattern = compile('(^(2[0-3]|[01]?[0-9]):([0-5]?[0-9])$)')

while True:
#   Function for input validetion of time.
    def get_time(text):

        while True:
            time_str = input(text)
            is_valid = pattern.match(time_str)
            if is_valid:
                break
            else:
                print('Invalid time format! Please retry..\n')

        return datetime.strptime(time_str, '%H:%M')

    Day_start = get_time('Enter start time HH:MM ')
    Day_end = get_time('Enter end time HH:MM ')

    time_value = get_time('Enter lunch HH:MM ')
    lunch = timedelta(hours = time_value.hour, minutes = time_value.minute)

#   Calculate work time.
    difference = Day_end - Day_start - lunch

    print('\nWork Time:', difference)

    cmd = input('Press q to exit:')
    if cmd == 'q':
        break

Мое приложение PyQt5.

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'time_02.ui'
#
# Created by: PyQt5 UI code generator 5.13.0
#
# WARNING! All changes made in this file will be lost!


from PyQt5 import QtCore, QtGui, QtWidgets
from datetime import *


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.FromTime = QtWidgets.QTimeEdit(self.centralwidget)
        self.FromTime.setGeometry(QtCore.QRect(100, 40, 118, 22))
        self.FromTime.setObjectName("FromTime")
        self.Submit = QtWidgets.QPushButton(self.centralwidget)
        self.Submit.setGeometry(QtCore.QRect(290, 40, 75, 23))
        self.Submit.setObjectName("Submit")
        self.FT_HourLCD = QtWidgets.QLCDNumber(self.centralwidget)
        self.FT_HourLCD.setGeometry(QtCore.QRect(100, 190, 64, 23))
        self.FT_HourLCD.setObjectName("FT_HourLCD")
        self.FT_MinuteLCD = QtWidgets.QLCDNumber(self.centralwidget)
        self.FT_MinuteLCD.setGeometry(QtCore.QRect(170, 190, 64, 23))
        self.FT_MinuteLCD.setObjectName("FT_MinuteLCD")
        self.From_Time_label = QtWidgets.QLabel(self.centralwidget)
        self.From_Time_label.setGeometry(QtCore.QRect(20, 40, 71, 16))
        font = QtGui.QFont()
        font.setPointSize(10)
        font.setBold(True)
        font.setWeight(75)
        self.From_Time_label.setFont(font)
        self.From_Time_label.setObjectName("From_Time_label")
        self.EndTime = QtWidgets.QTimeEdit(self.centralwidget)
        self.EndTime.setGeometry(QtCore.QRect(100, 80, 118, 22))
        self.EndTime.setObjectName("EndTime")
        self.End_time_label = QtWidgets.QLabel(self.centralwidget)
        self.End_time_label.setGeometry(QtCore.QRect(20, 80, 61, 16))
        font = QtGui.QFont()
        font.setPointSize(10)
        font.setBold(True)
        font.setWeight(75)
        self.End_time_label.setFont(font)
        self.End_time_label.setObjectName("End_time_label")
        self.Lunch = QtWidgets.QTimeEdit(self.centralwidget)
        self.Lunch.setGeometry(QtCore.QRect(100, 120, 118, 22))
        self.Lunch.setObjectName("Lunch")
        self.Lunch_label = QtWidgets.QLabel(self.centralwidget)
        self.Lunch_label.setGeometry(QtCore.QRect(20, 120, 71, 16))
        font = QtGui.QFont()
        font.setPointSize(10)
        font.setBold(True)
        font.setWeight(75)
        self.Lunch_label.setFont(font)
        self.Lunch_label.setObjectName("Lunch_label")
        self.ET_HourLCD = QtWidgets.QLCDNumber(self.centralwidget)
        self.ET_HourLCD.setGeometry(QtCore.QRect(100, 230, 64, 23))
        self.ET_HourLCD.setObjectName("ET_HourLCD")
        self.ET_MinuteLCD = QtWidgets.QLCDNumber(self.centralwidget)
        self.ET_MinuteLCD.setGeometry(QtCore.QRect(170, 230, 64, 23))
        self.ET_MinuteLCD.setObjectName("ET_MinuteLCD")
        self.Lunch_HourLCD = QtWidgets.QLCDNumber(self.centralwidget)
        self.Lunch_HourLCD.setGeometry(QtCore.QRect(100, 270, 64, 23))
        self.Lunch_HourLCD.setObjectName("Lunch_HourLCD")
        self.Lunch_MinuteLCD = QtWidgets.QLCDNumber(self.centralwidget)
        self.Lunch_MinuteLCD.setGeometry(QtCore.QRect(170, 270, 64, 23))
        self.Lunch_MinuteLCD.setObjectName("Lunch_MinuteLCD")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

#       **Inserted line to activate submit button.
        self.Submit.clicked.connect(self.pressed)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.Submit.setText(_translate("MainWindow", "Submit"))
        self.From_Time_label.setText(_translate("MainWindow", "From Time"))
        self.End_time_label.setText(_translate("MainWindow", "End Time"))
        self.Lunch_label.setText(_translate("MainWindow", "Lunch"))

#   **Test to see the values for From, Lunch and End time.
    def pressed(self):
#        print(self.FromTime.time())
#       From Time
        FT = self.FromTime.time()
        self.FT_HourLCD.display(FT.hour())
        self.FT_MinuteLCD.display(FT.minute())
#       End Time        
        ET = self.EndTime.time()
        self.ET_HourLCD.display(ET.hour())
        self.ET_MinuteLCD.display(ET.minute())
#       Lunch
        LT = self.Lunch.time()
        self.Lunch_HourLCD.display(LT.hour())
        self.Lunch_MinuteLCD.display(LT.minute())              

#   **Test to calculate time delta.
#        diff = ET - FT - LT

#   **Test to convert to python datetime function
        P_FT = FT.toPython()
#        print('Work Time:', diff)
        print('From Time ', P_FT)

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

С уважением, LasseAH