用Redis存儲(chǔ)好友關(guān)系-python版

feiyang10086

用Redis存儲(chǔ)好友關(guān)系-python版

這是一個(gè)用Redis存儲(chǔ)好友關(guān)系的python下使用Redis的例子。作者是Eric Florenzano (@ericflo)。相信對(duì)各位人生苦短用python的同學(xué)是一個(gè)好的入門(mén)例子。
例子說(shuō)明：其中雖然用了follow和block等字眼，但是他的關(guān)系不是一個(gè)微博系統(tǒng)的單向關(guān)注，而是類(lèi)似SNS的雙向關(guān)系。

1. """
   
2. I've been thinking lately about how perfect Redis would be for storing a
   
3. simple social graph. I posited that it would be relatively few lines of code,
   
4. and that it'd be clean code too. So here it is: a basic social graph built on Redis.
   
5. """
   
6. 
   
7. class FriendGraph(object):
   
8. 
   
9.     def __init__(self, ring):
   
10.         self.ring = ring
    
11. 
    
12.         # These keys are intentionally short, so as to save on memory in redis
    
13.         self.FOLLOWS_KEY = 'F'
    
14.         self.FOLLOWERS_KEY = 'f'
    
15.         self.BLOCKS_KEY = 'B'
    
16.         self.BLOCKED_KEY = 'b'
    
17. 
    
18.     def follow(self, from_user, to_user):
    
19.         forward_key = '%s:%s' % (self.FOLLOWS_KEY, from_user)
    
20.         forward = self.ring.sadd(forward_key, to_user)
    
21.         reverse_key = '%s:%s' % (self.FOLLOWERS_KEY, to_user)
    
22.         reverse = self.ring.sadd(reverse_key, from_user)
    
23.         return forward and reverse
    
24. 
    
25.     def unfollow(self, from_user, to_user):
    
26.         forward_key = '%s:%s' % (self.FOLLOWS_KEY, from_user)
    
27.         forward = self.ring.srem(forward_key, to_user)
    
28.         reverse_key = '%s:%s' % (self.FOLLOWERS_KEY, to_user)
    
29.         reverse = self.ring.srem(reverse_key, from_user)
    
30.         return forward and reverse
    
31. 
    
32.     def block(self, from_user, to_user):
    
33.         forward_key = '%s:%s' % (self.BLOCKS_KEY, from_user)
    
34.         forward = self.ring.sadd(forward_key, to_user)
    
35.         reverse_key = '%s:%s' % (self.BLOCKED_KEY, to_user)
    
36.         reverse = self.ring.sadd(reverse_key, from_user)
    
37.         return forward and reverse
    
38. 
    
39.     def unblock(self, from_user, to_user):
    
40.         forward_key = '%s:%s' % (self.BLOCKS_KEY, from_user)
    
41.         forward = self.ring.srem(forward_key, to_user)
    
42.         reverse_key = '%s:%s' % (self.BLOCKED_KEY, to_user)
    
43.         reverse = self.ring.srem(reverse_key, from_user)
    
44.         return forward and reverse
    
45. 
    
46.     def get_follows(self, user):
    
47.         follows = self.ring.smembers('%s:%s' % (self.FOLLOWS_KEY, user))
    
48.         blocked = self.ring.smembers('%s:%s' % (self.BLOCKED_KEY, user))
    
49.         return list(follows.difference(blocked))
    
50. 
    
51.     def get_followers(self, user):
    
52.         followers = self.ring.smembers('%s:%s' % (self.FOLLOWERS_KEY, user))
    
53.         blocks = self.ring.smembers('%s:%s' % (self.BLOCKS_KEY, user))
    
54.         return list(followers.difference(blocks))
    
55. 
    
56.     def get_blocks(self, user):
    
57.         return list(self.ring.smembers('%s:%s' % (self.BLOCKS_KEY, user)))
    
58. 
    
59.     def get_blocked(self, user):
    
60.         return list(self.ring.smembers('%s:%s' % (self.BLOCKED_KEY, user)))

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unknownmore

沒(méi)看懂....
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一樓的位置好啊..

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