python - PyQt5 button to run function and update LCD -


i getting started creating gui's in pyqt5 python 3. @ click of button want run "randomint" function , display returned integer qlcdnumber named "lcd".

here's code:

import sys pyqt5.qtwidgets import qapplication, qwidget, qvboxlayout, qpushbutton, qlcdnumber random import randint   class window(qwidget):     def __init__(self):         super().__init__()         self.initui()      def initui(self):         lcd = qlcdnumber(self)          button = qpushbutton('generate', self)         button.resize(button.sizehint())          layout = qvboxlayout()         layout.addwidget(lcd)         layout.addwidget(button)          self.setlayout(layout)         button.clicked.connect(lcd.display(self.randomint()))          self.setgeometry(300, 500, 250, 150)         self.setwindowtitle('rand integer')         self.show()      def randomint(self):         random = randint(2, 99)         return random  if __name__ == '__main__':     app = qapplication(sys.argv)     ex = window()     sys.exit(app.exec_())

i getting output:

typeerror: argument 1 has unexpected type 'nonetype'

how can lcd display output function "randomint"?

the problem button.clicked.connect expects slot (python callable object), lcd.display returns none. need simple function (slot) button.clicked.connect display newly generated value. working version:

import sys pyqt5.qtwidgets import qapplication, qwidget, qvboxlayout, qpushbutton, qlcdnumber random import randint   class window(qwidget):     def __init__(self):         super().__init__()         self.initui()       def initui(self):         self.lcd = qlcdnumber(self)          button = qpushbutton('generate', self)         button.resize(button.sizehint())          layout = qvboxlayout()         layout.addwidget(self.lcd)         layout.addwidget(button)          self.setlayout(layout)         button.clicked.connect(self.handlebutton)          self.setgeometry(300, 500, 250, 150)         self.setwindowtitle('rand integer')         self.show()       def handlebutton(self):         self.lcd.display(self.randomint())       def randomint(self):         random = randint(2, 99)         return random   if __name__ == '__main__':      app = qapplication(sys.argv)     ex = window()     sys.exit(app.exec_())

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