pyqt5_while_loop

import sys, time
from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QLineEdit, QRadioButton, QPushButton
from PyQt5.QtGui import QIcon, QFont

class Widget(QWidget):
    def __init__(self, parent=None):
        QWidget.__init__(self, parent)

        self.widget_layout = QVBoxLayout()

        # Making buttons
        self.radio1 = QPushButton('Radio 1')
        self.radio2 = QPushButton('Radio 2')

        # Making the text window
        self.line_edit = QLineEdit()
        font = self.line_edit.font()
        font.setPointSize(32)
        self.line_edit.setFont(font)

        # When the buttons get clicked
        self.radio1.clicked.connect(self.radio1_clicked) #[bool] makes it a toggle button?
        self.radio2.clicked.connect(self.radio2_clicked)

        # Place the buttons and line edit onto the screen.
        self.widget_layout.addWidget(self.radio1)
        self.widget_layout.addWidget(self.radio2)
        self.widget_layout.addWidget(self.line_edit)
        self.setWindowTitle('While loop test')  # Window name
        self.setWindowIcon(QIcon('violin.png'))  # Icon used by the window.
        self.setLayout(self.widget_layout)

    def radio1_clicked(self):
        self.line_edit.setText('Radio 1')

    def radio2_clicked(self):
        self.line_edit.setText('Radio 2')

timeout = time.time() + 60*5   # 5 minutes from now

if __name__ == '__main__':
  app = QApplication(sys.argv)
  widget = Widget()
  widget.show()
  widget.line_edit.setText('Text updated!')

  while True:
      test = 0
      if test == 5 or time.time() > timeout:
          break
      test = test - 1
      teststring = str(test)
      widget.line_edit.setText(teststring)

  sys.exit(app.exec_())