python Solutions when you find that QTimer is not available

As follows:

# -*- coding: utf-8 -*-
 
import numpy as np
from PyQt5.QtCore import QTimer, QObject
from PyQt5.QtWidgets import QWidget, QApplication
import sys
import time
 
 
class my_timer(QWidget):
 def __init__(self):
  super(my_timer, self).__init__()
  self.my_t = QTimer(self)
  # self.my_t.setInterval(1000)
  self.my_t.start(1000)
  self.my_t.timeout.connect(self.my_function)
 
 def my_function(self):
  for i in range(10):
   print('_(%s)' % str(i))
   time.sleep(0.5)
 
 
if __name__ == '__main__':
 app = QApplication(sys.argv)
 w = my_timer()
 w.show()
 sys.exit(app.exec_())

When you find that QTimer has no effect, please give QTimer to the interface. When you write QTimer to the interface, you will find that QTimer is working.