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comparison corebio/seq_io/null_io.py @ 0:c55bdc2fb9fa

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author davidmurphy
date Thu, 27 Oct 2011 12:09:09 -0400
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-1:000000000000 0:c55bdc2fb9fa
1 #!/usr/bin/env python
2
3 # Copyright (c) 2005 Gavin E. Crooks <gec@threeplusone.com>
4 #
5 # This software is distributed under the MIT Open Source License.
6 # <http://www.opensource.org/licenses/mit-license.html>
7 #
8 # Permission is hereby granted, free of charge, to any person obtaining a
9 # copy of this software and associated documentation files (the "Software"),
10 # to deal in the Software without restriction, including without limitation
11 # the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 # and/or sell copies of the Software, and to permit persons to whom the
13 # Software is furnished to do so, subject to the following conditions:
14 #
15 # The above copyright notice and this permission notice shall be included
16 # in all copies or substantial portions of the Software.
17 #
18 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 # THE SOFTWARE.
25 #
26
27 """Null sequence IO. Acts like /dev/null. Read returns empty sequences or sequence lists, writes do nothing."""
28
29
30 from corebio.seq import Seq, SeqList
31
32 names = ()
33 extensions = ()
34
35 def read(fin, alphabet=None):
36 assert fin is not None # Do something with arguments to quite pychecker
37 if alphabet is not None : pass
38 return SeqList([])
39
40 def iterseq(fin, alphabet=None) :
41 assert fin is not None
42 if alphabet is not None : pass
43 yield Seq('')
44 return
45
46 def write(fout, seqs):
47 assert fout is not None
48 assert seqs is not None
49 return
50
51
52 def writeseq(fout, seq):
53 assert fout is not None
54 assert seq is not None
55 return
56
57