Matching Pairs

import os
from random import shuffle, randint
from guizero import App, Box, Picture, PushButton, Text, TextBox, info, yesno

# global variables
GRID_SIZE   = 6 # must be even number
score       = 0
TimeLeft    = 30
emojis_dir  = "emojis"
emojis      = []
pictures    = []
buttons = []
TIME_BETWEEN = 1000

# Event Handlers

def btnClicked(button,filename):
    global buttons, score
    btn1.clicks += 1
    button.image = filename
    buttons.append(button)
    if btn1.clicks == 2:
        if buttons[0].image == buttons[1].image: # match found
            score += 1
            lblScore.value = f"Score: {score}"
            btn1.clicks = 0
            buttons = []
        else:
            btn1.timeLeft = TIME_BETWEEN
            btn1.repeat(100,myTimer)

def myTimer():
    global buttons
    btn1.timeLeft -= 100
    if btn1.timeLeft <= 0:
        btn1.cancel(myTimer)
        for btn in buttons:
            btn.image = 'blank.png'
        buttons = []
        btn1.clicks = 0

# Helper Functions

def setupRound():
    global buttons, pictures, emojis, score

    # load emoji filenames
    emojis = [os.path.join(emojis_dir, f) for f in os.listdir(emojis_dir) if os.path.isfile(os.path.join(emojis_dir, f))]
    # shuffle the emojis
    shuffle(emojis)


    # generate correct numbers of emojiis for game
    size = GRID_SIZE*GRID_SIZE
    images = ['']*size
    used = [False]*size
    for i in range(size // 2):
        image = emojis.pop()
        for j in range(2):  # do this twice so each image is in the grid twice
            pos = randint(0,size-1)
            while used[pos] == True:
                pos = randint(0,size-1)
            images[pos] = image
            used[pos] = True
    # for each picture button assign blank image and set up event handler to dislay correct image
    for i in range(len(pictures)):
        pictures[i].image = 'blank.png'
        pictures[i].update_command(btnClicked, [pictures[i],images[i]])

# .......................................................................................

# setup the app
app = App("emoji match", width = GRID_SIZE*100, height = GRID_SIZE*80, bg = 'white')
btn1 = PushButton(app,text='',visible = False)
btn1.clicks = 0
btn1.timeLeft = TIME_BETWEEN


# create a box to house the grids
gameBox = Box(app)
space = Box(gameBox, width = "fill", height = 60, align='top')
lblInstruct = Text(space, text = 'Find the matching pairs!',height = 3)

# create a box to house the pictures
picturesBox = Box(gameBox, layout="grid",align='left')


# create a box for score
scoreBox = Box(app, width = 'fill', height = 50, align='bottom')
lblScore = Text(scoreBox, text = '', width = 'fill', height = 'fill', color = 'blue')
lblScore.bg = 'light yellow'
lblScore.value = f"Score: {score}"

# create PushButtons with a different grid coordinate and add to the list
for x in range(0,GRID_SIZE):
    for y in range(0,GRID_SIZE):
        # put the pictures and buttons into the lists
        button = PushButton(picturesBox, grid=[x,y])
        pictures.append(button)


# call round setup
setupRound()

# Display app
app.display()