diff -r df2fdd42b375 Lib/shlex.py
--- a/Lib/shlex.py	Mon Aug 26 22:28:21 2013 +0200
+++ b/Lib/shlex.py	Tue Aug 27 21:57:27 2013 +0800
@@ -292,13 +292,19 @@
 
 if __name__ == '__main__':
     if len(sys.argv) == 1:
+        f = None
         lexer = shlex()
     else:
         file = sys.argv[1]
-        lexer = shlex(open(file), file)
-    while 1:
-        tt = lexer.get_token()
-        if tt:
-            print("Token: " + repr(tt))
-        else:
-            break
+        f = open(file)
+        lexer = shlex(f, file)
+    try:
+        while 1:
+            tt = lexer.get_token()
+            if tt:
+                print("Token: " + repr(tt))
+            else:
+                break
+    finally:
+        if f:
+            f.close()