you can try this:

        sized_btn = QPushButton( "Sized" )
        sized_btn.setFixedHeight( 100 )
        mBox = QMessageBox()
        mBox.setText("BOB")
        mBox.addButton(sized_btn, QMessageBox.AcceptRole)
        mBox.setStandardButtons( QMessageBox.Discard | QMessageBox.Cancel)

         mBox.setDefaultButton(sized_btn)
         mBox.exec_()

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