PyQt5 KeyPressEvent.py

import sys
from PyQt5.QtWidgets import (QApplication, QWidget)
from PyQt5.Qt import Qt

class MainWindow(QWidget):
	def __init__(self):
		super().__init__()
		
	def keyPressEvent(self, event):
		if event.key() == Qt.Key_Space:
			self.test_method()

	def test_method(self):
		print('Space key pressed')

if __name__ == '__main__':
	app = QApplication(sys.argv)

	demo = MainWindow()
	demo.show()

	sys.exit(app.exec_())