A 4x4 Field in Pygame

[SheeppOSU]

You can make a dictionary for the spaces. You can type out the dictionary or do this

mapDict = {}

for x in range(1, 17): #repeat 16 times
    mapDict.update({x : None}) #None means it isn't occupied

This function will check if the card can be moved

def CheckIfPossible(direction, space): #direction is the direction they are trying to move the card in. space is the space the card is in
    coordDict = {'x1' : 'left', 'x4' : 'right', 'y1' : 'up', 'y4' : 'down'} #Directions the card cannot go if at a specific coord
    y = #Get y coord as in 2 if it were in the 2nd row
    x = #Get x coord for example 1 if it were in the first column
    if x == 1 and coordDict['x1'] == direction.lower():
        return False
    elif x == 4 and coordDict['x4'] == direction.lower():
        return False
    elif y == 1 and coordDict['y1'] == direction.lower():
        return False
    elif y == 4 and coordDict['y4'] == direction.lower():
        return False
    return True

Hope this helps!