我rdflib
用来解析CommonCrawl microdata。这是一个很大的 N-Quads 格式文件。除了保存到 CSV 文件或打印到终端的最后阶段,一切都很好,因为它因编码错误而失败。
我目前的代码是:
import csv
import rdflib
from rdflib import ConjunctiveGraph, URIRef, Namespace, RDF, BNode
g = rdflib.ConjunctiveGraph()
g.parse("nquads.nquads", format="nquads")
with open('list.csv', 'wb') as csvfile:
csvwriter = csv.writer(csvfile, delimiter=',',
quotechar='"', quoting=csv.QUOTE_MINIMAL)
csvwriter.writerow(['URL'])
for ctx in q.quads:
s = ctx[3]
s = s[s.index("<") + 1:s.rindex(">")] # Gets URL between < and >
csvwriter.writerow([ s ])
这贯穿了许多 1000 行,但在某个点中断。
错误是:
UnicodeEncodeError: 'ascii' codec can't encode characters in position 62-63: ordinal not in range(128)
现在,我尝试了几件事:
s = ctx[3].toPython()
s = ctx[3].value()
s = str(ctx[3])
s = ctx[3].encode('utf-8')
s = ctx[3].encode('utf-8', 'ignore')
等等等等
ctx[3]
数据格式如下:
<http://www.serenabakessimplyfromscratch.com/2014/07/blueberry-cinnamon-swirl-crumb.html> a rdfg:Graph;rdflib:storage [a rdflib:Store;rdfs:label 'IOMemory'].
<http://www.seriouseats.com/recipes/2009/01/meat-lite-warm-winter-salad.html?ref=excerpt_readmore> a rdfg:Graph;rdflib:storage [a rdflib:Store;rdfs:label 'IOMemory'].
<http://www.grouprecipes.com/103118/broccoli-rice-casserole.html> a rdfg:Graph;rdflib:storage [a rdflib:Store;rdfs:label 'IOMemory'].
<http://www.grouprecipes.com/67612/asian-chicken-noodle-soup.html> a rdfg:Graph;rdflib:storage [a rdflib:Store;rdfs:label 'IOMemory'].
<http://www.grouprecipes.com/113715/bouillabaisse-style-fish-stew.html> a rdfg:Graph;rdflib:storage [a rdflib:Store;rdfs:label 'IOMemory'].
<http://www.drinksmixer.com/drink15xy188.html> a rdfg:Graph;rdflib:storage [a rdflib:Store;rdfs:label 'IOMemory'].
上面的代码在很多情况下都有效,可以正确提取 URL 并将其写入 CSV,但它不可避免地会在某些数据上中断。
如何从 RDFlib 正确获取文本内容?如何找出它的编码格式?还有其他方法可以获取文本内容吗?