from?Tkinter?import?*
import?tkMessageBoxsys
from?random?import?randint
?
class?Grid（object）:
????def?__init__（selfmaster=Nonewindow_width=800window_height=600grid_width=50offset=10）:
????????self.height?=?window_height
????????self.width?=?window_width
????????self.grid_width?=?grid_width
????????self.offset?=?offset
????????self.grid_x?=?self.width/self.grid_width
????????self.grid_y?=?self.height/self.grid_width
????????self.bg?=?“#EBEBEE“
????????self.canvas?=?Canvas（master?width=self.width+2*self.offset?height=self.height+2*self.offset?bg=self.bg）
????????self.canvas.pack（）
????????self.grid_list（）
????def?draw（self?pos?color）:
????????x?=?pos[0]*self.grid_width?+?self.offset
????????y?=?pos[1]*self.grid_width?+?self.offset
????????self.canvas.create_rectangle（x?y?x+self.grid_width?y+self.grid_widthfill=coloroutline=self.bg）
????def?grid_list（self）:
????????grid_list?=?[]
????????for?y?in?range（0self.grid_y）:
????????????for?x?in?range（0self.grid_x）:
????????????????grid_list.append（（xy））
????????self.grid_list?=?grid_list
?
class?Food（object）:
????def?__init__（self?Grid）:
????????self.grid?=?Grid
????????self.color?=?“#23D978“????????
????????self.set_pos（）
????def?set_pos（self）:
????????x?=?randint（0self.grid.grid_x?-?1）
????????y?=?randint（0self.grid.grid_y?-?1）
????????self.pos?=??（x?y）????
????def?display（self）:
????????self.grid.draw（self.posself.color）
?
class?Snake（object）:
????def?__init__（self?Grid）:
????????self.grid?=?Grid
????????self.body?=?[（106）（107）（108）]
????????self.direction?=?“Up“
????????self.status?=?[‘run‘‘stop‘]
????????self.speed?=?300
????????self.color?=?“#5FA8D9“????????
????????self.food?=?Food（self.grid）
????????self.display_food（）
????????self.gameover?=?False
????????self.score?=?0
????def?available_grid（self）:
????????return?[i?for?i?in?self.grid.grid_list?if?i?not?in?self.body[2:]]
????def?change_direction（self?direction）:
????????self.direction?=?direction
????def?display（self）:
????????for?（xy）?in?self.body:
????????????self.grid.dr