class Example(QWidget):
 def __init__(self):
  super()__init__()
  self.setupUI()

 def setupUI():
  self.show()
  pass
  # 设置UI
if __name__ == '__main__':
 app = QApplication(sys.argv) # 启动app
 ex = Example() # 实例化一个自己派生的
 # 也可以实例化库中的控件
 # q = QPushButton()
 # q.show()
 sys.exit(app.exec_())

import time, threading
def threadFunction():
 while True:
  print(11111)
  time.sleep()
# 用于命名，可以通过threading.current_thread().name获得
t = threading.Thread(target=threadFunction, name='funciton')
# 如果线程有参数
t = threading.Thread(target=threadFunction, args=(), name='funciton')
t.start()

from threading import Thread
import time

class Example(Thread):
 def __init__(self):
  super().__init__()

 def run(self):
  while True:
   time.sleep(1)
   print(11111111)

if __name__ == '__main__':
 a = Example()
 a.start()
 a.join()
 print(222222222)

class Example(QWidget):
 signal = pyqtSignal() # 括号里填写信号传递的参数
 # 发射信号
 def func(self):
  self.signal.emit()

# 使用信号
a = Example()
a.signal.connect(callback)

# 槽函数
def callback():
 pass

class Example(QThread):
 signal = pyqtSignal() # 括号里填写信号传递的参数
 def __init__(self):
  super().__init__()

 def __del__(self):
  self.wait()

 def run(self):
  # 进行任务操作
  self.signal.emit() # 发射信号

# UI类中
def buttonClick(self)
 self.thread = Example()
 self.thread.signal.connect(self.callback)
 self.thread.start() # 启动线程

def callbakc(self):
 pass