[Numpy-discussion] fromfile and tofile access with a tempfile.TemporaryFile()
hirzel at resonon.com
Tue Dec 12 15:56:08 CST 2006
Good thought Chris,
Normal reading and writing does seem to work. ..
But, my friend Daniel figured out a workaround when I asked to confirm
this behavior on his windows setup (and it is does behave the same for
him). The first clue was this:
>>> f = tempfile.TemporaryFile()
>>> g = open("temp","w+b")
so Daniel did a dir(f) and found the 'file' attribute
so if you do (where 'a' is a numpy array)
writing to the "file" attribute of the TemporaryFile, it works fine! So
that's good, but still a little hinky. Especially since it works on
on a linux platform, what does type(tempfile.TemporaryFile()) return? I
assume an <type 'instance'> as well...
anways, so at least there is a quick repair for now. Good news is, I
assume using 'f.file' would work on linux too in terms of having a
single cross-platform solution.
Christopher Barker wrote:
> did you try reading and writing to/from that temp file with regular old
> python functions?
> Tim Hirzel wrote:
>>> I'm running linux and the current svn version of numpy. Maybe the
>>> problem is with the tempfile module on windows. Do fromfile and tofile
>>> work for files opened normally?
>> fromfile and tofile work fine on regular files. From skimming the code
>> a bit, it's hard to imagine numpy code is the culprit, since it must be
>> getting a NULL pointer back from PyFile_AsFile(file)... Perhaps this is
>> a question for a python dev list? My gut says it's probably something
>> in the windows tempfile module. But perhaps in the PyFile_AsFile(file)
>> implementation. Seems one of those isn't playing nice. It's all quite
>> mysterious to me...
>> Numpy-discussion mailing list
>> Numpy-discussion at scipy.org
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