def __init__(self, board = None, parent = None): super(QWidget, self).__init__() policy = QSizePolicy(QSizePolicy.Preferred, QSizePolicy.Preferred) self.setSizePolicy(policy) if(board == None): board = Bitboard() board.castling_rights = CASTLING_NONE self.board = board self.parent = parent self.borderWidth = 12 self.pieceImages = PieceImages() self.selected_xy = None self.pcs = [['P','R','B','N','Q','K'],['p','r','b','n','q','k']] self.initUI()