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498
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1 #!/usr/bin/env python
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2
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3 """
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4 filename -> file-like object as a decorator
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5 """
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6
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7 import optparse
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8 import os
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9 import sys
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10
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11 string = (basestring,)
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12
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13 class fileobj(object):
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14 def __init__(self, arg, *args, **kwargs):
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15 self._args = [arg] + list(args)
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16 self._kwargs = kwargs
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17 # mode, filename, ...
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18
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19 # function
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20 self.func = arg if not args else None
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21 def __call__(self, *args, **kwargs):
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22 if self.func is None:
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23 raise NotImplementedError
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24 else:
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25 if len(args) and isinstance(args[0], string):
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26 args = list(args)
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27 with file(args[0], 'w') as fp:
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28 args[0] =fp
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29 return self.func(*args, **kwargs)
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30 return self.func(*args, **kwargs)
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31
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32 if __name__ == '__main__':
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33 # test code
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34 import os
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35 import tempfile
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36
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37 @fileobj
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38 def test1(fp):
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39 fp.write('foo')
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40
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41 filename = tempfile.mktemp()
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42 print filename
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43 assert not os.path.exists(filename)
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44 test1(filename)
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45 assert os.path.exists(filename)
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46 print file(filename).read()
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