add a sample script about tags extraction

test/extract_tags.py

@@ -0,0 +1,33 @@
+import sys
+sys.path.append('../')
+
+import jieba
+import jieba.analyse
+from optparse import OptionParser
+
+USAGE ="usage:    python extract_tags.py [file name] -k [top k]"
+
+parser = OptionParser(USAGE)
+parser.add_option("-k",dest="topK")
+opt, args = parser.parse_args()
+
+
+if len(args) <1:
+	print USAGE
+	sys.exit(1)
+
+file_name = args[0]
+
+if opt.topK==None:
+	topK=10
+else:
+	topK = int(opt.topK)
+
+
+content = open(file_name,'rb').read()
+
+tags = jieba.analyse.extract_tags(content,topK=topK)
+
+print ",".join(tags)
+
+