Python Good camera

from plyer import camera
from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.camera import Camera
from kivy.uix.boxlayout import BoxLayout

class CameraApp(App):
    def build(self):
        # create a layout
        layout = BoxLayout()

        # create a camera widget
        cam = Camera(index=0, resolution=(640,480))

        # create a button that will take a picture
        button = Button(text='Take Picture')

        # bind the button's on_press event to a callback function
        button.bind(on_press=self.take_picture)

        # add the camera and the button to the layout
        layout.add_widget(cam)
        layout.add_widget(button)

        return layout

    def take_picture(self, *args):
        # use plyer.camera.take_picture to take a picture
        # pass a filename where to save the picture
        # pass a callback function that will be called after taking picture
        camera.take_picture(filename='my_picture.jpg', on_complete=self.picture_taken)

    def picture_taken(self, obj):
        # this function will be called after taking picture
        # obj is either the filename where picture was saved or None if error occurred
        if obj:
            print('Picture saved at ' + obj)
        else:
            print('Error taking picture')

# run the app
CameraApp().run()