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