•Python2.7
# -*- coding: utf-8 -*-
import sys

from PyQt4 import QtCore
from PyQt4.QtCore import QCoreApplication
from PyQt4.QtGui import QWidget, QPushButton, QApplication, QTextBrowser


class TimeThread(QtCore.QThread):
  signal_time = QtCore.pyqtSignal(str, int) # 信号

  def __init__(self, parent=None):
    super(TimeThread, self).__init__(parent)
    self.working = True
    self.num = 0

  def start_timer(self):
    self.num = 0
    self.start()

  def run(self):
    while self.working:
      print "Working", self.thread()
      self.signal_time.emit("Running time:", self.num) # 发送信号
      self.num += 1
      self.sleep(1)


class TimeDialog(QWidget):
  def __init__(self):
    super(TimeDialog, self).__init__()
    self.timer_tv = QTextBrowser(self)
    self.init_ui()
    self.timer_t = TimeThread()
    self.timer_t.signal_time.connect(self.update_timer_tv)

  def init_ui(self):
    self.resize(300, 200)
    self.setWindowTitle('TimeDialog')
    self.timer_tv.setText("Wait")
    self.timer_tv.setGeometry(QtCore.QRect(10, 145, 198, 26))
    self.timer_tv.move(0, 15)

    btn1 = QPushButton('Quit', self)
    btn1.setToolTip('Click to quit')
    btn1.resize(btn1.sizeHint())
    btn1.move(200, 150)
    btn1.clicked.connect(QCoreApplication.instance().quit)

    start_btn = QPushButton('Start', self)
    start_btn.setToolTip("Click to start")
    start_btn.move(50, 150)
    self.connect(start_btn, QtCore.SIGNAL("clicked()"), self.click_start_btn)

  def click_start_btn(self):
    self.timer_t.start_timer()

  def update_timer_tv(self, text, number):
    self.timer_tv.setText(self.tr(text + " " + str(number)))


if __name__ == '__main__':
  app = QApplication(sys.argv)
  time_dialog = TimeDialog()
  time_dialog.show()

  sys.exit(app.exec_())