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Source Code:

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QHBoxLayout, QVBoxLayout, QLabel, QShortcut
from PyQt5.QtCore import Qt, QPoint
from PyQt5.QtGui import QKeySequence


class MyApp(QWidget):
    def __init__(self):
        super().__init__()
        self.window_width, self.window_height = 1200, 800
        self.setMinimumSize(self.window_width, self.window_height)

        self.label = QLabel(self)
        self.label.setText('Hello')
        self.label.move(150, 150)

        QShortcut(QKeySequence(Qt.Key_Left), self, activated=self.move_left)
        QShortcut(QKeySequence(Qt.Key_Right), self, activated=self.move_right)
        QShortcut(QKeySequence(Qt.Key_Up), self, activated=self.move_up)
        QShortcut(QKeySequence(Qt.Key_Down), self, activated=self.move_down)

    def move_left(self):
        self.label.move(self.label.pos() + QPoint(-15, 0))

    def move_right(self):
        self.label.move(self.label.pos() + QPoint(15, 0))

    def move_up(self):
        self.label.move(self.label.pos() + QPoint(0, -15))

    def move_down(self):
        self.label.move(self.label.pos() + QPoint(0, 15))

if __name__ == '__main__':
    # don't auto scale when drag app to a different monitor.
    # QApplication.setAttribute(Qt.HighDpiScaleFactorRoundingPolicy.PassThrough)
    
    app = QApplication(sys.argv)
    app.setStyleSheet('''
        QWidget {
            font-size: 45px;
        }
    ''')
    
    myApp = MyApp()
    myApp.show()

    try:
        sys.exit(app.exec_())
    except SystemExit:
        print('Closing Window...')