1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
#!/usr/bin/env python
from __future__ import division
import sys
import time
import string
import random
from colour import hash_colour
from random import randint
from collections import deque
from copy import deepcopy
import traceback
from common import *
class SnakeEngine(object):
def __init__(self, rows, columns, n_apples, results=False):
super(SnakeEngine, self).__init__()
self.bots = {}
self.results = None
if results:
self.results = open('results.csv', 'a+')
self.new_game(rows, columns, n_apples)
def get_random_position(self):
x = randint(0, self.columns - 1)
y = randint(0, self.rows - 1)
return (x, y)
def replace_random(self, old, new):
for i in xrange(self.rows * self.columns):
x, y = self.get_random_position()
if self.board[y][x] == old:
self.board[y][x] = new
return x, y
def new_game(self, rows, columns, n_apples):
self.start_time = time.time()
self.game_id = random.randint(0, sys.maxint)
self.letters = list(string.lowercase)
self.letters.reverse()
self.rows = rows
self.columns = columns
# make board
self.board = [[Squares.EMPTY for x in xrange(columns)] for y in xrange(rows)]
for i in xrange(n_apples):
x, y = self.get_random_position()
self.board[y][x] = Squares.APPLE
def add_bot(self, bot):
"""
A bot is a callable object, with this method signature:
def bot_callable(
board=[[cell for cell in row] for row in board],
position=(snake_x, snake_y)
):
return random.choice('RULD')
"""
letter = self.letters.pop()
name = bot.__name__
colour = hash_colour(name)
position = self.replace_random(Squares.EMPTY, letter.upper())
if position is None:
raise KeyError, "Could not insert snake into the board."
self.bots[letter] = [bot, colour, deque([position])]
return letter
def remove_bot(self, letter):
letter = letter.lower()
time_score = time.time() - self.start_time
for row in self.board:
for x, cell in enumerate(row):
if cell.lower() == letter:
row[x] = Squares.EMPTY
bot = self.bots[letter]
del self.bots[letter]
if not self.results:
return
try:
name = bot[0].__name__
except AttributeError:
pass
else:
apple_score = len(bot[2])
self.results.write('%s,%s,%s,%s\n' % \
(self.game_id, name, apple_score, time_score))
self.results.flush()
def update_snakes(self, directions_id=id(directions)):
assert id(directions) == directions_id, \
"The common.directions dictionary has been modified since startup..."
for letter, (bot, colour, path) in self.bots.items():
board = deepcopy(self.board)
try:
x, y = path[-1]
d = bot(board, (x, y))
# Sanity checking...
assert isinstance(d, basestring), \
"Return value should be a string."
d = d.upper()
assert d in directions, "Return value should be 'U', 'D', 'L' or 'R'."
# Get new position.
dx, dy = directions[d]
nx = x + dx
ny = y + dy
if ny < 0 or ny >= self.rows or nx < 0 or nx >= self.columns:
self.remove_bot(letter)
continue
oldcell = self.board[ny][nx]
if oldcell in (Squares.EMPTY, Squares.APPLE):
# Move snake forward.
self.board[ny][nx] = letter.upper()
path.append((nx, ny))
# Make old head into body.
self.board[y][x] = letter.lower()
if oldcell == Squares.APPLE:
# Add in an apple to compensate.
self.replace_random(Squares.EMPTY, Squares.APPLE)
else:
# Remove last part of snake.
ox, oy = path.popleft()
self.board[oy][ox] = Squares.EMPTY
else:
self.remove_bot(letter)
except:
print "Exception in bot %s (%s):" % (letter.upper(), bot)
print '-'*60
traceback.print_exc()
print '-'*60
self.remove_bot(letter)
|
