Check mate or not

checkmate.py

otherPiecesMoves = Pawn(7,2).possibleMoves() + Tower(5,3).possibleMoves() + Bishop(2,7).possibleMoves() + Queen(3,2).possibleMoves()+ Knight(6,6).possibleMoves()
king = King(5,8)
print("King's moves: ",king.possibleMoves())

stillAliveMoves = []

for m in king.possibleMoves():
    if m not in otherPiecesMoves:
        stillAliveMoves.append(m)

if len(stillAliveMoves) == 0:
    print("Check mate!")
else:
    print("Possible moves: ",stillAliveMoves)