Making a tkinter memory game
<p>I am making a memory game in Tkinter. However, I am at the point where I'm trying to flip cards over. The first card works, it flips over. Then the second card doesn't flip over, maybe immediately flips over again. Can you please help me</p>

<pre><code>import tkinter as tk
import time
from random import randint
from random import shuffle
win = tk.Tk()
canvas = tk.Canvas(win, width = 500, height = 500)
canvas.pack()
class Tile(object):
    def __init__(self, x, y, text):
        self.y = y
        self.x = x
        self.text = text
    def drawFaceDown(self):
        canvas.create_rectangle(self.x, self.y, self.x + 70, self.y + 70, fill = "blue")
        self.isFaceUp = False
    def drawFaceUp(self):
        canvas.create_rectangle(self.x, self.y, self.x + 70, self.y + 70, fill = "blue")
        canvas.create_text(self.x + 35, self.y + 35, text = self.text, width = 70)
        self.isFaceUp = True
    def isUnderMouse(self, event):
        if(event.x &gt; self.x and event.x &lt; self.x + 70):
            if(event.y &gt; self.y and event.y &lt; self.y + 70):
                return True

tiles = []
colors = [
    "Red",
    "Orange",
    "Yellow",
    "Green",
    "Blue",
    "Purple",
    "Pink",
    "Brown",
    "Black",
    "Gray",
    "Magenta",
    "Maroon"
]

selected = []
for i in range(10):
    randomInd = randint(0, len(colors) - 1)
    color = colors[randomInd]
    selected.append(color)
    selected.append(color)
    del colors[randomInd]
shuffle(selected)

flippedTiles = []

def mouseClicked(self):
    global numFlipped
    global flippedTiles
    for i in range(len(tiles)):
        if tiles[i].isUnderMouse(self):
            if (len(flippedTiles) &lt; 2 and not(tiles[i].isFaceUp)) :
                tiles[i].drawFaceUp()
                flippedTiles.append(tiles[i])
            if (len(flippedTiles) == 2):
                if not(flippedTiles[0].text == flippedTiles[1].text):
                    time.sleep(1)
                    flippedTiles[0].drawFaceDown()
                    flippedTiles[1].drawFaceDown()

NUM_COLS = 5
NUM_ROWS = 4

for x in range(0,NUM_COLS):
    for y in range(0,NUM_ROWS):
            tiles.append(Tile(x * 78 + 10, y * 78 + 40, selected.pop()))

for i in range(len(tiles)):
    tiles[i].drawFaceDown()

win.bind("&lt;Button-1&gt;", mouseClicked)


win.mainloop()
</code></pre>