old_contents: import io
  # import time
  import picamera
  from . import config
  
  class Camera:
      def __init__(self):
          self.camera = picamera.PiCamera(resolution=config.CAPTURE_RESOLUTION)
          self.preview_alpha = 200
  
      def capture(self):
          stream = io.BytesIO()
          self.camera.capture(stream, 'rgb', resize=config.CAPTURE_RESIZE)
          stream.seek(0)
          return stream
  
      def toggle_preview(self):
          if self.camera.preview is None:
              self.camera.start_preview()
              self.camera.preview.alpha = self.preview_alpha
          else:
              self.camera.stop_preview()
  
      def start_preview(self, alpha=255):
          self.camera.start_preview()
          self.camera.preview.alpha = alpha
  
      def stop_preview(self):
          self.camera.stop_preview()
  
      def stop(self):
          self.camera.close()
  
new_contents: import io
  # import time
  import picamera
  from . import config
  
  class Camera:
      def __init__(self):
          self.camera = picamera.PiCamera(resolution=config.CAPTURE_RESOLUTION)
          self.camera.hflip = True
          self.preview_alpha = 200
  
      def capture(self):
          stream = io.BytesIO()
          self.camera.capture(stream, 'rgb', resize=config.CAPTURE_RESIZE)
          stream.seek(0)
          return stream
  
      def toggle_preview(self):
          if self.camera.preview is None:
              self.camera.start_preview(hflip = True)
              self.camera.preview.alpha = self.preview_alpha
          else:
              self.camera.stop_preview()
  
      def start_preview(self, alpha=255):
          self.camera.start_preview()
          self.camera.preview.alpha = alpha
  
      def stop_preview(self):
          self.camera.stop_preview()
  
      def stop(self):
          self.camera.close()
  
subject: Enable hflip for capture and preview