mistery.py

import pygame
import random

class Mistery(pygame.sprite.Sprite):
    def __init__(self, screen):
        super(Mistery, self).__init__()
        self.screen = screen
        self.image = pygame.image.load("icons/mysteryb.ico")
        self.rect = self.image.get_rect()
        self.rect.x = self.rect.width
        self.rect.y = self.rect.height
        self.x = float(self.rect.x)
        self.y = 40
        self.is_appear = False
        self.move_x = 2.5

    def print(self):
        self.screen.blit(self.image, self.rect)

    def update(self):
        if (not self.is_appear):
            if random.randint(0, 1000) == 1:
                self.start()
            return

        if self.rect.x - 30 > self.screen.get_width() or self.rect.x < -30:
            self.is_appear = False

        self.x += self.move_x
        self.rect.x = self.x

    def start(self):
        self.is_appear = True

        if random.randint(0, 2) == 1:
            self.x = -30
            self.rect.x = self.x
            self.rect.y = self.y
            self.move_x = abs(self.move_x)
        else:
            self.x = self.screen.get_width() + 30
            self.rect.x = self.x
            self.rect.y = self.y
            self.move_x = -abs(self.move_x)