qtを使用して文字列を画面に表示するだけの試み

以下のような、文字列を画面に表示するだけの試み

１年に１回くらいこのような文字列を表示したい時がある。
以下はコードと実行方法

環境：ubuntu20.04

display.py

from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui 
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys 
from argparse import ArgumentParser
import subprocess

def get_option(player_name):
    argparser = ArgumentParser()
    argparser.add_argument('--player_name', type=str,
                           default=player_name,
                           help='player name')
    return argparser.parse_args()

class Window(QMainWindow): 

    def __init__(self): 
        super().__init__() 

        # setting title 
        self.setWindowTitle("Player information") 

        # show information
        self.player_name = "testuser"
        args = get_option(self.player_name)
        if len(args.player_name) != 0:
            self.player_name = args.player_name

        # setting geometry
        upper_left = (10,10)
        width_height = (500, 75)
        self.setGeometry(upper_left[0], upper_left[1],
                         width_height[0], width_height[1]) 

        # calling method 
        self.UiComponents() 

        # showing all the widgets 
        self.show() 

    # method for widgets 
    def UiComponents(self): 

        # creating a label to show the time 
        self.label = QLabel(self)
        label_upper_left = (15, 15)
        label_width_height = (450, 50)
        self.label.setGeometry(label_upper_left[0], label_upper_left[1], 
                               label_width_height[0], label_width_height[1]) 
        self.label.setStyleSheet("border : 4px solid black;") 
        self.label.setText(self.gettimertext())
        self.label.setFont(QFont('Arial', 28))
        self.label.setAlignment(Qt.AlignCenter) 

    def gettimertext(self):
        text = "Player: " + self.player_name
        return text

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

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

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

以下のように実行する

python3 display.py --player_name "test_string"