8 puzzle game

[aliyark145]

Show us what you have done (in Python code tags) and explain what doesn't work the way you want. Post also full error traceback message, in case you get errors (in error tags).
You might also want to explain the assignment in more detail, for those of us (like me), who don't know how that game should work.

from copy import deepcopy

class puzzle:
    def __init__ (self, starting, parent):      #Constructor
        self.board = starting
        self.parent = parent
        self.f = 0
        self.g = 0
        self.h = 0

    def manhattan(self):
        h = 0
        for i in range(3):                  #Manhattan definition
            for j in range(3):
                x, y = divmod(self.board[i][j], 3)          #getting the remainder and quotient of the  current value
                h += abs(x-i) + abs(y-j)                    #calculating manhanttan distance
        return h

    def goal(self):
        inc = 0                                                        #checking whether goal state is achieved
        for i in range(3):
            for j in range(3):
                if self.board[i][j] != inc:
                    return False
                inc += 1
        return True

    def __eq__(self, other):
        return self.board == other.board                        #check is boards are equal or not

def move_function(curr):
    curr = curr.board
    for i in range(3):
        for j in range(3):              #move function to move the tile
            if curr[i][j] == 0:
                x, y = i, j
                break
    q = []
    if x-1 >= 0:
        b = deepcopy(curr)
        b[x][y]=b[x-1][y]
        b[x-1][y]=0
        succ = puzzle(b, curr)
        q.append(succ)
    if x+1 < 3:
        b = deepcopy(curr)
        b[x][y]=b[x+1][y]
        b[x+1][y]=0
        succ = puzzle(b, curr)
        q.append(succ)
    if y-1 >= 0:
        b = deepcopy(curr)
        b[x][y]=b[x][y-1]
        b[x][y-1]=0
        succ = puzzle(b, curr)
        q.append(succ)
    if y+1 < 3:
        b = deepcopy(curr)
        b[x][y]=b[x][y+1]
        b[x][y+1]=0
        succ = puzzle(b, curr)
        q.append(succ)

    return q

def best_fvalue(openList):
    f = openList[0].f
    index = 0
    for i, item in enumerate(openList):
        if i == 0: 
            continue
        if(item.f < f):
            f = item.f
            index  = i

    return openList[index], index

def AStar(start):
    openList = []
    closedList = []
    openList.append(start)

    while openList:
        current, index = best_fvalue(openList)
        if current.goal():
            return current
        openList.pop(index)
        closedList.append(current)

        X = move_function(current)
        for move in X:
            ok = False   #checking in closedList
            for i, item in enumerate(closedList):
                if item == move:
                    ok = True
                    break
            if not ok:              #not in closed list
                newG = current.g + 1 
                present = False

                #openList includes move
                for j, item in enumerate(openList):
                    if item == move:
                        present = True
                        if newG < openList[j].g:
                            openList[j].g = newG
                            openList[j].f = openList[j].g + openList[j].h
                            openList[j].parent = current
                if not present:
                    move.g = newG
                    move.h = move.manhattan()
                    move.f = move.g + move.h
                    move.parent = current
                    openList.append(move)

    return None


#start = puzzle([[2,3,6],[0,1,8],[4,5,7]], None)
start = puzzle([[5,2,8],[4,1,7],[0,3,6]], None)
# start = puzzle([[0,1,2],[3,4,5],[6,7,8]], None)
#start = puzzle([[1,2,0],[3,4,5],[6,7,8]], None)
result = AStar(start)
noofMoves = 0

if(not result):
    print ("No solution")
else:
    print(result.board)
    t=result.parent
    while t:
        noofMoves += 1
        print(t.board)
        t=t.parent
print ("Length: " + str(noofMoves))