Move a sprite with the mouse and collect blocks

Course- Python >
import pygame
import random
 
# Define some colors
BLACK = ( 0, 0, 0)
WHITE = (255, 255, 255)
RED = (255, 0, 0)
 
class Block(pygame.sprite.Sprite):
"""
This class represents the ball.
It derives from the "Sprite" class in Pygame.
"""
 
def __init__(self, color, width, height):
""" Constructor. Pass in the color of the block,
and its x and y position. """
 
# Call the parent class (Sprite) constructor
super().__init__()
 
# Create an image of the block, and fill it with a color.
# This could also be an image loaded from the disk.
self.image = pygame.Surface([width, height])
self.image.fill(color)
 
# Fetch the rectangle object that has the dimensions of the image
# image.
# Update the position of this object by setting the values
# of rect.x and rect.y
self.rect = self.image.get_rect()
 
# Initialize Pygame
pygame.init()
 
# Set the height and width of the screen
screen_width = 700
screen_height = 400
screen = pygame.display.set_mode([screen_width, screen_height])
 
# This is a list of 'sprites.' Each block in the program is
# added to this list. The list is managed by a class called 'Group.'
block_list = pygame.sprite.Group()
 
# This is a list of every sprite.
# All blocks and the player block as well.
all_sprites_list = pygame.sprite.Group()
 
for i in range(50):
# This represents a block
block = Block(BLACK, 20, 15)
 
# Set a random location for the block
block.rect.x = random.randrange(screen_width)
block.rect.y = random.randrange(screen_height)
 
# Add the block to the list of objects
block_list.add(block)
all_sprites_list.add(block)
 
# Create a RED player block
player = Block(RED, 20, 15)
all_sprites_list.add(player)
 
# Loop until the user clicks the close button.
done = False
 
# Used to manage how fast the screen updates
clock = pygame.time.Clock()
 
score = 0
 
# -------- Main Program Loop -----------
while not done:
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
 
# Clear the screen
screen.fill(WHITE)
 
# Get the current mouse position. This returns the position
# as a list of two numbers.
pos = pygame.mouse.get_pos()
 
# Fetch the x and y out of the list,
# just like we'd fetch letters out of a string.
# Set the player object to the mouse location
player.rect.x = pos[0]
player.rect.y = pos[1]
 
# See if the player block has collided with anything.
blocks_hit_list = pygame.sprite.spritecollide(player, block_list, True)
 
# Check the list of collisions.
for block in blocks_hit_list:
score += 1
print(score)
 
# Draw all the spites
all_sprites_list.draw(screen)
 
# Go ahead and update the screen with what we've drawn.
pygame.display.flip()
 
# Limit to 60 frames per second
clock.tick(60)
 
pygame.quit()