enemy.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# Standard modules
import random
import os

# Third-party modules
from pygame.sprite import Sprite
from pygame.image import load

SPEED = 7
FLY_SPEED = 5
Enemies = [
    os.path.join("bird", "enemy_1.png")
]


class Enemy(Sprite):
    def __init__(self, x):
        Sprite.__init__(self)

        self.was = False
        self.image = load(Enemies[0])
        self.rect = self.image.get_rect()
        self.rect.x = x
        self.rect.y = random.randrange(0, 450)
        self.width_enemy, self.height_enemy = self.image.get_size()
        self.direct_y = random.randrange(-FLY_SPEED, FLY_SPEED)

    def draw(self, screen):
        screen.blit(self.image, (self.rect.x, self.rect.y))

    def update(self):
        # if not bird.end:
        self.rect.y += self.direct_y
        self.rect.x -= SPEED
        if self.rect.y + self.height_enemy >= 450 or self.rect.y < 0:
            self.direct_y = -self.direct_y

    def per(self, bird):
        if (bird.rect.x > self.rect.x + self.width_enemy) and not self.was:
            bird.score += 1
            self.was = True