import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
class MyWindow(QWidget):
 def __init__(self,parent=None):
 super(MyWindow,self).__init__(parent)
 self.setWindowTitle("弹出式对话框例子")
 self.resize(400,200)
 self.btn1=QPushButton(self)
 self.btn1.setText("消息框")
 self.btn1.clicked.connect(self.msg1)
 layout=QVBoxLayout()

 self.btn2=QPushButton(self)
 self.btn2.setText("问答对话框")
 self.btn2.clicked.connect(self.msg2)

 self.btn3=QPushButton()
 self.btn3.setText("警告对话框")
 self.btn3.clicked.connect(self.msg3)

 self.btn4=QPushButton()
 self.btn4.setText("严重错误对话框")
 self.btn4.clicked.connect(self.msg4)

 self.btn5=QPushButton()
 self.btn5.setText("关于对话框")
 self.btn5.clicked.connect(self.msg5)

 layout.addWidget(self.btn1)
 layout.addWidget(self.btn2)
 layout.addWidget(self.btn3)
 layout.addWidget(self.btn4)
 layout.addWidget(self.btn5)

 self.setLayout(layout)

 
 def msg1(self):
 #使用infomation信息框
 QMessageBox.information(self,"标题","消息正文",QMessageBox.Yes|QMessageBox.No,QMessageBox.Yes)
 def msg2(self):
  QMessageBox.question(self,"标题","问答消息正文",QMessageBox.Yes|QMessageBox.No,QMessageBox.Yes)
 def msg3(self):
 QMessageBox.warning(self,"标题","警告消息正文",QMessageBox.Yes|QMessageBox.No,QMessageBox.Yes)
 def msg4(self):
 QMessageBox.critical(self,"标题","严重错误消息正文",QMessageBox.Yes|QMessageBox.No,QMessageBox.Yes)
 def msg5(self):
 QMessageBox.about(self,"标题","关于消息正文")

if __name__=="__main__":
 app=QApplication(sys.argv)
 win=MyWindow()
 win.show()
 sys.exit(app.exec_())