-
Notifications
You must be signed in to change notification settings - Fork 0
/
ExampleStrategies.py
70 lines (62 loc) · 1.67 KB
/
ExampleStrategies.py
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
import random
def randomStrategy():
return random.choice([
alwaysCooperate,
alwaysDefect,
fiftyFifty,
randomChance(random.random()),
trustUntilBetrayed,
trustUntilBetrayedNTimes(random.randint(1, 10)),
trustUntilBetrayedNTimesLimitedMemory(random.randint(1, 10), random.randint(10, 30))
])
def alwaysCooperate(*args):
'''Always cooperate with opponents'''
return 0
def alwaysDefect(*args):
'''Always defect from opponents'''
return 1
def fiftyFifty(*args):
'''Fifty fifty chance of cooperating or defecting'''
return random.randint(0, 1)
def randomChance(chance):
'''Betray with a probability of `chance`'''
def f(me, opponent):
if random.random() > chance:
return 1
else:
return 0
return f
def trustUntilBetrayed(me, opponent):
'''Cooperate with opponents until they betray you - then defect from them'''
try:
if [i[1] for i in me.history[opponent]].count(1) > 0:
return 1
else:
return 0
except KeyError:
#No previous history with this opponent
return 0
def trustUntilBetrayedNTimes(n):
'''Cooperate with opponents until they have betrayed you N times - then defect from them'''
def f(me, opponent):
try:
if [i[1] for i in me.history[opponent]].count(1) > n-1:
return 1
else:
return 0
except KeyError:
#No previous history with this opponent
return 0
return f
def trustUntilBetrayedNTimesLimitedMemory(n, m):
'''Cooperate with opponents who have betrayed you fewer than n times in the last m encounters'''
def f(me, opponent):
try:
if [i[1] for i in me.history[opponent]][-m:].count(1) > n-1:
return 1
else:
return 0
except KeyError:
#No previous history with this opponent
return 0
return f