[Python] Pyqt5 - how to hide QInputDialog close button [closed]

After creating a QInputDialog window using PyQt5, I can't hide the close button.

I tried the following code :

import sys
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import (QApplication,QMainWindow,QInputDialog)

if __name__=='__main__':

app = QApplication(sys.argv)
mainwindow = QMainWindow()
mainwindow.show()
window = QInputDialog()
window.setWindowFlags(window.windowFlags() & Qt.WindowTitleHint & Qt.CustomizeWindowHint)
window.exec_()
sys.exit(app.exec_())

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