item.py

import pygame.sprite

class Item(pygame.sprite.Sprite):
    def __init__(self, x, y, item_type, animation_types, static, price=0):
        pygame.sprite.Sprite.__init__(self)
        self.animations = animation_types
        self.item = item_type
        self.frame_index = 0
        self.update_time = pygame.time.get_ticks()
        self.image = self.animations[self.frame_index]
        self.rect = self.image.get_rect()
        self.rect.center = (x, y)
        self.static = static
        self.price = price

    def update(self, screen_scroll, player, coin_fx, potion_fx):
        # repositions item if the screen moves
        if not self.static:
            self.rect.x += screen_scroll[0]
            self.rect.y += screen_scroll[1]

        # if item has been collected
        if self.rect.colliderect(player.rect) and self.price <= player.money:
            if self.item == 0:
                player.money += 1
                coin_fx.play()
            elif self.item == 1:
                player.health += 10
                potion_fx.play()
                if player.health > 100:
                    player.health = 100
            # subtracts item price from player wallet
            player.money -= self.price
            self.kill()

        # animates the item
        animation_cd = 100
        self.image = self.animations[self.frame_index]
        if pygame.time.get_ticks() - self.update_time > animation_cd:
            self.frame_index += 1
            self.update_time = pygame.time.get_ticks()
        if self.frame_index >= len(self.animations):
            self.frame_index = 0

    def draw(self, surface):
        surface.blit(self.image, self.rect)