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
|
from rdflib import Graph, URIRef
import unittest
class GraphSlice(unittest.TestCase):
def testSlice(self):
"""
We pervert the slice object,
and use start, stop, step as subject, predicate, object
all operations return generators over full triples
"""
sl=lambda x,y: self.assertEquals(len(list(x)),y)
soe=lambda x,y: self.assertEquals(set([a[2] for a in x]),set(y)) # equals objects
g=self.graph
# Single terms are all trivial:
# single index slices by subject, i.e. return triples((x,None,None))
# tell me everything about "tarek"
sl(g[self.tarek],2)
# single slice slices by s,p,o, with : used to split
# tell me everything about "tarek" (same as above)
sl(g[self.tarek::],2)
# give me every "likes" relationship
sl(g[:self.likes:],5)
# give me every relationship to pizza
sl(g[::self.pizza],3)
# give me everyone who likes pizza
sl(g[:self.likes:self.pizza],2)
# does tarek like pizza?
self.assertTrue(g[self.tarek:self.likes:self.pizza])
# More intesting is using paths
# everything hated or liked
sl(g[:self.hates|self.likes], 7)
def setUp(self):
self.graph = Graph()
self.michel = URIRef(u'michel')
self.tarek = URIRef(u'tarek')
self.bob = URIRef(u'bob')
self.likes = URIRef(u'likes')
self.hates = URIRef(u'hates')
self.pizza = URIRef(u'pizza')
self.cheese = URIRef(u'cheese')
self.addStuff()
def addStuff(self):
tarek = self.tarek
michel = self.michel
bob = self.bob
likes = self.likes
hates = self.hates
pizza = self.pizza
cheese = self.cheese
self.graph.add((tarek, likes, pizza))
self.graph.add((tarek, likes, cheese))
self.graph.add((michel, likes, pizza))
self.graph.add((michel, likes, cheese))
self.graph.add((bob, likes, cheese))
self.graph.add((bob, hates, pizza))
self.graph.add((bob, hates, michel)) # gasp!
if __name__ == '__main__':
unittest.main()
|
