Pygame DriftSprite or SlidingSprite Example

import pygame

class DriftSprite(pygame.sprite.Sprite):
    def __init__(self, image, position, speed, friction):
        super().__init__()
        self.image = image
        self.rect = image.get_rect(center=position)
        self.center = pygame.Vector2(self.rect.center)
        self.vector = pygame.Vector2()
        self.friction = friction
        self.throttle = 0
        self.speed = speed

    def move(self, delta, vector=None):
        if vector is None:
            vector = self.vector
            if self.throttle > 0:
                self.throttle -= self.friction * delta
        else:
            self.vector = vector
            self.throttle = self.speed

        if self.throttle > 0:
            self.center += vector * self.throttle * delta
            self.rect.center = self.center

def main():
    # Basic Pygame Setup
    pygame.init()
    pygame.display.set_caption("Example")
    surface = pygame.display.set_mode((800, 600))
    clock = pygame.time.Clock()
    rect = surface.get_rect()
    running = True
    delta = 0
    fps = 60

    # Variables
    background = 'grey10'
    image = pygame.Surface((30, 30))
    image.fill('skyblue')
    player = DriftSprite(image, rect.center, 80, 240)
    sprites = pygame.sprite.Group(player)
    idle = pygame.Vector2()
    dkey = {'up': (pygame.K_UP, pygame.K_w),
            'down': (pygame.K_DOWN, pygame.K_s),
            'left': (pygame.K_LEFT, pygame.K_a),
            'right': (pygame.K_RIGHT, pygame.K_d)}

    is_pressed = lambda key, dk: any([key[k] for k in dk])

    # Main Loop
    while running:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                running = False

        # Logic
        direction = pygame.Vector2()
        pressed = pygame.key.get_pressed()

        if is_pressed(pressed, dkey['left']):
            direction.x -= 1

        if is_pressed(pressed, dkey['right']):
            direction.x += 1

        if is_pressed(pressed, dkey['up']):
            direction.y -= 1

        if is_pressed(pressed, dkey['down']):
            direction.y += 1

        if direction != idle:
            player.move(delta, direction.normalize())
        else:
            player.move(delta)

        # Draw
        surface.fill(background)
        sprites.draw(surface)
        pygame.display.flip()
        delta = clock.tick(fps) * 0.001

main()