#-*-?coding:utf-8?-*-

import?curses
from?random?import?randrange?choice?#?generate?and?place?new?tile
from?collections?import?defaultdict

letter_codes?=?[ord（ch）?for?ch?in?‘WASDRQwasdrq‘]
actions?=?[‘Up‘?‘Left‘?‘Down‘?‘Right‘?‘Restart‘?‘Exit‘]
actions_dict?=?dict（zip（letter_codes?actions?*?2））

def?get_user_action（keyboard）:????
????char?=?“N“
????while?char?not?in?actions_dict:????
????????char?=?keyboard.getch（）
????return?actions_dict[char]

def?transpose（field）:
????return?[list（row）?for?row?in?zip（*field）]

def?invert（field）:
????return?[row[::-1]?for?row?in?field]

class?GameField（object）:
????def?__init__（self?height=4?width=4?win=2048）:
????????self.height?=?height
????????self.width?=?width
????????self.win_value?=?win
????????self.score?=?0