Game Code

import pygame

pygame.init()

clock = pygame.time.Clock()
fps = 160

screen = pygame.display.set_mode((500,500))
pygame.display.set_caption("Game 2")
screen.fill((255,255,255))

class Player(pygame.sprite.Sprite):
    def __init__(self,x,y,width,height):
        pygame.sprite.Sprite.__init__(self)
        self.x = x
        self.y = y
        self.width = width
        self.height = height
        self.right = False
        self.left = False
        self.up = False
        self.down = False
        self.surf = pygame.Surface((50,50))
        self.rect = self.surf.get_rect()

    def draw(self):
        pygame.draw.rect(screen, (0,0,0), (self.x, self.y, self.width, self.height))

    def collision_test(self, block1):
        if pygame.sprite.collide_rect(self, block1):
            print("a collision is detected")

def move_player():
    if player.right == True:
        player.x += 2
    elif player.left == True:
        player.x -= 2
    elif player.up == True:
        player.y -= 2
    elif player.down == True:
        player.y += 2

class Block1(pygame.sprite.Sprite):
    def __init__(self,x,y,width,height):
        pygame.sprite.Sprite.__init__(self)
        self.x = x
        self.y = y
        self.width = width
        self.height = height
        self.surf = pygame.Surface((self.width,self.height))
        self.rect = self.surf.get_rect()

    def draw(self):
        pygame.draw.rect(screen, (150,150,150), (self.x, self.y, self.width, self.height))

player = Player(50,50,50,50)
block1 = Block1(200, 200, 100, 100)

def redrawGameWindow():
    screen.fill((255, 255, 255))
    player.draw()
    block1.draw()
    pygame.display.update()

run = True
while run:

    clock.tick(fps)

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()

        keys = pygame.key.get_pressed()

        if keys[pygame.K_RIGHT]:
            player.right = True
            player.left = False
            player.up = False
            player.down = False

        elif keys[pygame.K_LEFT]:
            player.left = True
            player.right = False
            player.up = False
            player.down = False

        elif keys[pygame.K_UP]:
            player.up = True
            player.right = False
            player.left = False
            player.down = False

        elif keys[pygame.K_DOWN]:
            player.down = True
            player.right = False
            player.left = False
            player.up = False

        else:
            player.right = False
            player.left = False
            player.up = False
            player.down = False

    move_player()

    player.collision_test()

    redrawGameWindow()