diff -r cda76ef561a2 Lib/formatter.py
--- a/Lib/formatter.py	Sat Aug 03 02:49:53 2013 -0700
+++ b/Lib/formatter.py	Sat Aug 03 21:50:28 2013 +0800
@@ -439,6 +439,10 @@
         else:
             f.add_flowing_data(line)
     f.end_paragraph(0)
+    try:
+        fp.close()
+    except:
+        pass
 
 
 if __name__ == '__main__':