signal Example 001

import sys
from PyQt5.QtWidgets import QWidget,QLCDNumber,QSlider,QVBoxLayout,QApplication
from PyQt5.QtCore import Qt
class WinForm(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
    def initUI(self):
        lcd=QLCDNumber(self)
        slider=QSlider(Qt.Horizontal,self)

        vBox=QVBoxLayout()
        vBox.addWidget(lcd)
        vBox.addWidget(slider)

        self.setLayout(vBox)
        slider.valueChanged.connect(lcd.display)

        self.setGeometry(300,300,350,150)
        self.setWindowTitle("signal example")

if __name__ == "__main__":
    app=QApplication(sys.argv)
    form =WinForm()
    form.show()
    sys.exit(app.exec())