new_contents: #!/usr/bin/python3
  # -*- coding: utf-8 -*-
  
  """
  Test code for controlling QMessageBox format.
  """
  
  import sys
  from PyQt5.QtGui import QPixmap
  from PyQt5.QtWidgets import (QApplication, QLabel, QWidget, QMessageBox,
                               QSpinBox, QLineEdit, QPushButton,
                               QHBoxLayout, QVBoxLayout)
  
  
  class TestMsgBox(QWidget):
      """Application to demonstrate the Morse Trainer 'grouping' widget."""
  
      def __init__(self):
          super().__init__()
          self.initUI()
  
      def initUI(self):
          lbl_font = QLabel('Font size', self)
          self.spb_fontsize = QSpinBox(self)
          self.spb_fontsize.setMinimum(1)
          self.spb_fontsize.setMaximum(20)
          lbl_msg = QLabel('Message', self)
          self.led_message = QLineEdit()
          btn_test = QPushButton('Test', self)
  
          hbox1 = QHBoxLayout()
          hbox1.addWidget(lbl_font)
          hbox1.addWidget(self.spb_fontsize)
          hbox1.addStretch()
  
          hbox2 = QHBoxLayout()
          hbox2.addWidget(lbl_msg)
          hbox2.addWidget(self.led_message)
          hbox2.addStretch()
  
          hbox3 = QHBoxLayout()
          hbox3.addStretch()
          hbox3.addWidget(btn_test)
  
          vbox = QVBoxLayout(self)
          self.setLayout(vbox)
          vbox.addLayout(hbox1)
          vbox.addLayout(hbox2)
          vbox.addLayout(hbox3)
  
          self.setGeometry(100, 100, 800, 300)
          self.setWindowTitle('Test of QMessageBox')
          self.show()
  
          btn_test.clicked.connect(self.test_msgbox)
  
      def test_msgbox(self):
          font_size = self.spb_fontsize.value()
          message = self.led_message.text()
          msg = ['<font size=%d>' % font_size,
                 'font size=%d<br>' % font_size,
                 message,
                 '<br>',
                 '</font>']
          msgbox = QMessageBox(self)
          msgbox.setText('Koch promotion')
          msgbox.setInformativeText(''.join(msg))
          msgbox.setStandardButtons(QMessageBox.Ok)
          msgbox.setDefaultButton(QMessageBox.Ok)
          msgbox.setMinimumWidth(800)
          msgbox.setMaximumWidth(800)
          msgbox.exec()
  #        QMessageBox.information(self, 'Test', ''.join(msg), QMessageBox.Ok)
  
  app = QApplication(sys.argv)
  ex = TestMsgBox()
  sys.exit(app.exec())
  
subject: Test program for QMessageBox formatting