python如何写个俄罗斯方块

class MainBoard(QFrame):
 msg = pyqtSignal(str)
 BoardWidth = 10
 BoardHeight = 20
 Speed = 300

 def __init__(self, parent):
  super().__init__(parent)
  self.initBoard()

 def initBoard(self):
  self.timer = QBasicTimer()
  self.isWaitingAfterLine = False
  self.curX = 0
  self.curY = 0
  self.numLinesRemoved = 0
  self.board = []
  self.setFocusPolicy(Qt.StrongFocus)
  self.isStarted = False
  self.isPaused = False
  self.clearBoard()

class ShapeForm(object):
 NoShape = 0
 ZShape = 1
 SShape = 2
 LineShape = 3
 TShape = 4
 SquareShape = 5
 LShape = 6
 MirroredLShape = 7

class Shape(object):
 coordsTable = (
  ((0, 0),  (0, 0),  (0, 0),  (0, 0)),
  ((0, -1), (0, 0),  (-1, 0), (-1, 1)),
  ((0, -1), (0, 0),  (1, 0),  (1, 1)),
  ((0, -1), (0, 0),  (0, 1),  (0, 2)),
  ((-1, 0), (0, 0),  (1, 0),  (0, 1)),
  ((0, 0),  (1, 0),  (0, 1),  (1, 1)),
  ((-1, -1), (0, -1), (0, 0),  (0, 1)),
  ((1, -1), (0, -1), (0, 0),  (0, 1))
 )

 def __init__(self):
  self.coords = [[0,0] for i in range(4)]
  self.pieceShape = ShapeForm.NoShape
  self.setShape(ShapeForm.NoShape)

 def shape(self):
  return self.pieceShape

 def setShape(self, shape):
  table = Shape.coordsTable[shape]
  for i in range(4):
   for j in range(2):
    self.coords[i][j] = table[i][j]
  self.pieceShape = shape

def timerEvent(self, event):
	if event.timerId() == self.timer.timerId():
		if self.isWaitingAfterLine:
			self.isWaitingAfterLine = False
			self.newPiece()
		else:
			self.oneLineDown()
	else:
		super(MainBoard, self).timerEvent(event)

def keyPressEvent(self, event):
	if not self.isStarted or self.curPiece.shape() == ShapeForm.NoShape:
		super(MainBoard, self).keyPressEvent(event)
		return
	key = event.key()
	if key == Qt.Key_P:
		self.pause()
		return
	if self.isPaused:
		return
	elif key == Qt.Key_Left:
		self.tryMove(self.curPiece, self.curX - 1, self.curY)
	elif key == Qt.Key_Right:
		self.tryMove(self.curPiece, self.curX + 1, self.curY)
	elif key == Qt.Key_Down:
		self.tryMove(self.curPiece.rotateRight(), self.curX, self.curY)
	elif key == Qt.Key_Up:
		self.tryMove(self.curPiece.rotateLeft(), self.curX, self.curY)
	elif key == Qt.Key_Space:
		self.dropDown()
	elif key == Qt.Key_D:
		self.oneLineDown()
	else:
		super(MainBoard, self).keyPressEvent(event)

def removeFullLines(self):
	numFullLines = 0
	rowsToRemove = []
	for i in range(MainBoard.BoardHeight):
		n = 0
		for j in range(MainBoard.BoardWidth):
			if not self.shapeAt(j, i) == ShapeForm.NoShape:
				n = n + 1
		if n == 10:
			rowsToRemove.append(i)
	rowsToRemove.reverse()
	for m in rowsToRemove:
		for k in range(m, MainBoard.BoardHeight):
			for l in range(MainBoard.BoardWidth):
					self.setShapeAt(l, k, self.shapeAt(l, k + 1))
	numFullLines = numFullLines + len(rowsToRemove)
	if numFullLines > 0:
		self.numLinesRemoved = self.numLinesRemoved + numFullLines
		self.msg.emit(str(self.numLinesRemoved))
		self.isWaitingAfterLine = True
		self.curPiece.setShape(ShapeForm.NoShape)
		self.update()