--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/corebio/seq_io/null_io.py	Fri Jan 13 07:18:19 2012 -0500
@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+ 
+#  Copyright (c) 2005 Gavin E. Crooks <gec@threeplusone.com>
+#
+#  This software is distributed under the MIT Open Source License.
+#  <http://www.opensource.org/licenses/mit-license.html>
+#
+#  Permission is hereby granted, free of charge, to any person obtaining a 
+#  copy of this software and associated documentation files (the "Software"),
+#  to deal in the Software without restriction, including without limitation
+#  the rights to use, copy, modify, merge, publish, distribute, sublicense,
+#  and/or sell copies of the Software, and to permit persons to whom the
+#  Software is furnished to do so, subject to the following conditions:
+#
+#  The above copyright notice and this permission notice shall be included
+#  in all copies or substantial portions of the Software.
+#
+#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
+#  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+#  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+#  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
+#  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+#  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 
+#  THE SOFTWARE.
+#
+
+"""Null sequence IO. Acts like /dev/null. Read returns empty sequences or sequence lists, writes do nothing."""
+
+
+from corebio.seq import Seq, SeqList
+
+names = ()
+extensions = ()
+
+def read(fin, alphabet=None):       
+    assert fin is not None    # Do something with arguments to quite pychecker
+    if alphabet is not None : pass
+    return SeqList([])
+
+def iterseq(fin, alphabet=None) :
+    assert fin is not None
+    if alphabet is not None : pass
+    yield Seq('')
+    return
+
+def write(fout, seqs): 
+    assert fout is not None
+    assert seqs is not None
+    return
+
+    
+def writeseq(fout, seq):
+    assert fout is not None
+    assert seq is not None
+    return
+
+            
\ No newline at end of file