pip install pyinstaller

def rp(relative_path):
 """ Get absolute path to resource, works for dev and for PyInstaller """
 try:
  # PyInstaller creates a temp folder and stores path in _MEIPASS
  base_path = sys._MEIPASS
 except Exception:
  base_path = os.path.abspath(".")

 return os.path.join(base_path, relative_path)

BASICFONT = pygame.font.Font(rp('C:\Windows\Fonts\simsun.ttc'), 18)
titleFont = pygame.font.Font(rp('C:\Windows\Fonts\simsun.ttc'), 100)
gameOverFont = pygame.font.Font(rp('freesansbold.ttf'), 100)

def rp(relative_path):
 """ Get absolute path to resource, works for dev and for PyInstaller """
 try:
  # PyInstaller creates a temp folder and stores path in _MEIPASS
  base_path = sys._MEIPASS
 except Exception:
  base_path = os.path.abspath(".")

 return os.path.join(base_path, relative_path)

bgimg = rp(os.path.join('src','background.jpg'))
print(bgimg)