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comparison python/fileobj.py @ 498:95ba5770d2f0

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file decorator
author Jeff Hammel <jhammel@mozilla.com>
date Wed, 21 Aug 2013 15:54:09 -0700
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497:2e51a55d303d 498:95ba5770d2f0
1 #!/usr/bin/env python
2
3 """
4 filename -> file-like object as a decorator
5 """
6
7 import optparse
8 import os
9 import sys
10
11 string = (basestring,)
12
13 class fileobj(object):
14 def __init__(self, arg, *args, **kwargs):
15 self._args = [arg] + list(args)
16 self._kwargs = kwargs
17 # mode, filename, ...
18
19 # function
20 self.func = arg if not args else None
21 def __call__(self, *args, **kwargs):
22 if self.func is None:
23 raise NotImplementedError
24 else:
25 if len(args) and isinstance(args[0], string):
26 args = list(args)
27 with file(args[0], 'w') as fp:
28 args[0] =fp
29 return self.func(*args, **kwargs)
30 return self.func(*args, **kwargs)
31
32 if __name__ == '__main__':
33 # test code
34 import os
35 import tempfile
36
37 @fileobj
38 def test1(fp):
39 fp.write('foo')
40
41 filename = tempfile.mktemp()
42 print filename
43 assert not os.path.exists(filename)
44 test1(filename)
45 assert os.path.exists(filename)
46 print file(filename).read()