PyQT5 - Signals & Slots Tutorial

from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *

import sys

class Window(QMainWindow):
    def __init__(self):
        super().__init__()

        self.title = 'PyQt5 - Events, Signals & Slots'
        self.top = 100
        self.left = 100
        self.width = 400
        self.height = 300

        self.InitWindow()

    def InitWindow(self):
        self.setWindowIcon(QIcon('skull_icon.png'))
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)

        self.CreateButton()
        self.show()

    def CreateButton(self):
        self.button = QPushButton('Close', self).setGeometry(QRect(100, 100, 111, 50))
        self.button.clicked.connect(self.ClickMe())

    def ClickMe(self):
        sys.exit()


if __name__ == '__main__':
    App = QApplication(sys.argv)
    window = Window()
    sys.exit(App.exec())