PyQt5 – How to change font and size of Label text ?

# importing the required libraries

from PyQt5.QtWidgets import * 
from PyQt5.QtGui import * 
import sys

class Window(QMainWindow):
    def __init__(self):
        super().__init__()

        # set the title
        self.setWindowTitle("Label")

        # setting  the geometry of window
        self.setGeometry(0, 0, 400, 300)

        # creating a label widget
        # by default label will display at top left corner
        self.label_1 = QLabel('Arial font', self)

        # moving position
        self.label_1.move(100, 100)

        # setting font and size
        self.label_1.setFont(QFont('Arial', 10))

        # creating a label widget
        # by default label will display at top left corner
        self.label_2 = QLabel('Times font', self)

        # moving position
        self.label_2.move(100, 120)

        # setting font and size
        self.label_2.setFont(QFont('Times', 10))


        # show all the widgets
        self.show()



# create pyqt5 app
App = QApplication(sys.argv)

# create the instance of our Window
window = Window()

# start the app
sys.exit(App.exec())