import sys
from PyQt5.QtWidgets import QMessageBox,QPushButton,QApplication,QWidget
app=QApplication(sys.argv)
widget=QWidget()
def showMsg():
 QMessageBox.information(widget,'信息提示框','Ok 弹出测试信息')
btn=QPushButton('测试点击按钮',widget)
btn.clicked.connect(showMsg)
widget.show()
sys.exit(app.exec_())

from PyQt5.QtCore import QObject,pyqtSignal
#信号对象
class QTypeSignal(QObject):
 #定义一个信号
 # sendmsg = pyqtSignal(object)
 #todo 优化 多个参数传递
 sendmsg=pyqtSignal(str,str)
 def __init__(self):
 super(QTypeSignal, self).__init__()
 def run( self ):
 #发射信号
 #self.sendmsg.emit('hell')
 #todo 优化 发射多个参数
 self.sendmsg.emit('第一参数','第二个参数')
#槽对象
class QTypeSlot(QObject):
 def __init__(self):
 super(QTypeSlot, self).__init__()
 #槽对象中的槽函数
 # def get( self,msg ):
 # print("QSlot get msg => " + msg)
 #todo 优化 多个参数
 def get( self,msg1,msg2 ):
 print("QSlot get msg => " + msg1+' '+msg2)
if __name__ == '__main__':
 #实例化信号对象
 send=QTypeSignal()
 #实例化槽对象
 slot=QTypeSlot()
 #1
 print('_____-把信号绑定到槽函数上_____')
 send.sendmsg.connect(slot.get)
 send.run()
 print('_____-把信号与槽函数解绑_____')
 send.sendmsg.disconnect(slot.get)
 send.run()

@PyQt5.QtCore.pyqtSlot(参数)
def on_发送者对象名称_发射信号名称(self,参数)：
 pass

...
class Window(QWidget):
 def __init__(self, *args, **kwargs):
 super().__init__(*args, **kwargs)
 self.setWindowTitle('装饰器信号与槽')
 self.resize(500, 500)
 self.move(400, 200)
 self.btn = QPushButton('按钮', self)
 self.init_ui()
 
 def init_ui(self):
 self.btn.clicked.connect(self.btn_hand)
 
 @staticmethod
 def btn_hand():
 print('使用connect点击了按钮')
...

...
class Window(QWidget):
 def __init__(self, *args, **kwargs):
 super().__init__(*args, **kwargs)
 self.setWindowTitle('装饰器信号与槽')
 self.resize(500, 500)
 self.move(400, 200)
 self.btn = QPushButton('按钮', self)
 self.init_ui()
 # 要在加载组件后使用
 QMetaObject.connectSlotsByName(self)
 
 def init_ui(self):
 # 这个地方定义的名字直接在下面使用
 self.btn.setObjectName('btn')
 
 @pyqtSlot()
 def on_btn_clicked(self):
 print('使用装饰器点击了按钮')