diff --git a/test/extract_tags.py b/test/extract_tags.py
index 58e7de3..3298749 100644
--- a/test/extract_tags.py
+++ b/test/extract_tags.py
@@ -5,29 +5,26 @@ import jieba
 import jieba.analyse
 from optparse import OptionParser
 
-USAGE ="usage:    python extract_tags.py [file name] -k [top k]"
+USAGE = "usage:    python extract_tags.py [file name] -k [top k]"
 
 parser = OptionParser(USAGE)
-parser.add_option("-k",dest="topK")
+parser.add_option("-k", dest="topK")
 opt, args = parser.parse_args()
 
 
-if len(args) <1:
-	print USAGE
-	sys.exit(1)
+if len(args) < 1:
+    print USAGE
+    sys.exit(1)
 
 file_name = args[0]
 
-if opt.topK==None:
-	topK=10
+if opt.topK is None:
+    topK = 10
 else:
-	topK = int(opt.topK)
+    topK = int(opt.topK)
 
+content = open(file_name, 'rb').read()
 
-content = open(file_name,'rb').read()
-
-tags = jieba.analyse.extract_tags(content,topK=topK)
+tags = jieba.analyse.extract_tags(content, topK=topK)
 
 print ",".join(tags)
-
-