Circular Moves

# check if given set of moves is circular on not
def checkCircularMove(str1):
    x = 0
    y = 0
    N=0
    E=1
    S=2
    W=3
    dir1 =N

    for move in str1:
        if move == 'R':
            dir1 = int((dir1 + 1) % 4)
        if move == 'L':
            dir1 = int((4 + dir1 - 1) % 4)


        if move == 'M':
            if dir1 == N:
                y = y + 1
            if dir1 == S:
                y = y - 1
            if dir1 == E:
                x = x + 1
            if dir1 == W:
                x = x - 1
    if x == 0 and y == 0:
        return True
    else:
        return False


if __name__ == '__main__':
    # str = "MMRMMRMMRMMR"
    str = "ML"

    if checkCircularMove(str):
        print("Sequence of moves are circular")
    else:
        print("Sequence of moves are not circular")