# -*- coding: utf-8 -*-
  
import sys
from PyQt5.QtCore import QThread, pyqtSignal
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, QMessageBox, \
  QPushButton, QLineEdit, QLabel, QToolTip, QComboBox, QTextEdit
  
  
class MyBeautifulClass(QMainWindow):
  def __init__(self):
    super(MyBeautifulClass, self).__init__()
    self.init_ui()
  
  def init_ui(self):
    self.resize(1000, 800)
    self.setWindowTitle('Demo of PyQt5 QThread')
    self.btn_1 = QPushButton('start', self)
    self.btn_1.setGeometry(100, 100, 100, 50)
    self.btn_1.clicked.connect(self.slot_btn_1)
    self.linEdit_2 = QLineEdit(self)
    self.linEdit_2.setGeometry(100, 400, 300, 50)
  
  def slot_btn_1(self):
    self.mbt = MyBeautifulThread()
    self.mbt.trigger.connect(self.slot_thread)
    self.mbt.start()
  
  def say_love(self):
    print('say love')
  
  def slot_thread(self, msg_1, msg_2):
    self.linEdit_2.setText(msg_1 + msg_2)
  
  
class MyBeautifulThread(QThread):
  trigger = pyqtSignal(str, str)
  
  def __init__(self):
    super(MyBeautifulThread, self).__init__()
  
  def run(self):
    w = MyBeautifulClass()
    w.say_love()
    self.trigger.emit('Lo', 've')
  
  
def main():
  app = QApplication(sys.argv)
  w = MyBeautifulClass()
  w.show()
  sys.exit(app.exec_())
  
  
if __name__ == '__main__':
  main()