example_1.py

import arcade

SCREEN_WIDTH = 600
SCREEN_HEIGHT = 800
SCREEN_TITLE = 'Welcome to Arcade'
RADIUS = 150

arcade.open_window(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
arcade.set_background_color(arcade.color.WHITE)

arcade.start_render()

arcade.draw_circle_filled(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2, RADIUS,
                          arcade.color.BLUE)

arcade.finish_render()

arcade.run()