pyqt提示对话框

1. from PyQt4.QtGui import *
   
2. from PyQt4.QtCore import *
   
3. import sys
   
4. 
   
5. app = QApplication(sys.argv)
   
6. msg_box = QMessageBox(QMessageBox.Warning, "Alert", "Please configure the baseline!")
   
7. msg_box.show()
   
8. app.exec_()

ss
if the alert show when click some button, should show like this:

1. msg_box = QMessageBox(QMessageBox.Warning, "Alert", "Please configure the baseline!")
   
2. 
   
3. msg_box.exec_()