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import sys
from PyQt5.QtWidgets import *


class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.showMaximized()


app = QApplication(sys.argv)
QApplication.setApplicationName('Chrome Killer')

it is supposed to open a black window called "Chrome Killer" but it does nothing i dont know what to do. Please help.

You didn't create an instance of MainWindow or call app.exec_

import sys

from PyQt5.QtWidgets import *


class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.showMaximized()


app = QApplication(sys.argv)
QApplication.setApplicationName('Chrome Killer')
mainwindow = MainWindow()
sys.exit(app.exec_())