Consider the following program that uses a device's camera to scan a QR code and then navigates to the URL represented by the QR code on the device's browser:

class Camera(StrEnum):
  FRONT = "front"
  BACK = "back"

@dataclass
class QRScanner:
camera: Camera = Camera.FRONT

def choose_camera(self, camera: Camera) -> None:
   print(f"Choosing camera {camera.value}.")
   self.camera = camera

def scan(self) -> str:
   print(f"Scanning QR code with {self.camera.value} camera.")
   return "https://www.arjancodes.com"

class Browser:
  def open(self, url: str) -> None:
    print(f"Opening {url} in the browser.")

  def open_from_qr_code(self) -> None:
    qr = QRScanner()
    qr.choose_camera(Camera.BACK)
    url = qr.scan()
    self.open(url)

def main() -> None:
  print("Navigating to website on device.")
  browser = Browser()
  browser.open_from_qr_code()