Thank you all for answering my question. I thought it would be some
misunderstanding on my part. The example Andrei made was very
telling.
Andrei wrote:
>>>>s = "d:/tests/test.txt"
>>>>class dummyfile(object):
>>>>
>>>>
>... def open(self, *args):
>... print "dummyfile.open:", args
>... def write(self, *args):
>... print "dummyfile.write:", args
>... def read(self, *args):
>... print "dummyfile.read:", args
>... return ""
>
>
>>>>def dummyopen(filename, type):
>>>>
>>>>
>... print "dummyopen:", filename, type
>... d = dummyfile()
>... d.open(filename, type)
>... return d
>
>
>
>>>>dummyopen(s, 'w').write(dummyopen(s, 'r').read())
>>>>
>>>>
>dummyopen: d:/tests/test.txt w
>dummyfile.open: ('d:/tests/test.txt', 'w') <--- first open for
writing
>dummyopen: d:/tests/test.txt r
>dummyfile.open: ('d:/tests/test.txt', 'r') <--- then for reading
>dummyfile.read: ()
>dummyfile.write: ('',)
>
>
>
>>spend 5 hours RTFM. I got it to work by breaking it up to several
>>statements, but I would like to know.
>>
>>
>
>And that's the way you *should* write it - code like this doesn't
deserve to
>work anyway :).
>
>Yours,
>
>Andrei
>
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>
>
>
>
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