Help needed: file writing problem with subprocess

[Fredrik Lundh]

Pekka Niiranen wrote:

> I am running Python script in W2K or in WinXP.
> The script is started from DOS prompt and writes text file to disk
> with codecs.open() in UTF8.
>
> The problem is: When script writes the file and tries to read it
> with by calling itself thru subprocess() the created files are
> NOT accessible because they have not been written into disk yet.
> fh.flush() and os.fsync() do not work.
>
> -- extract from "myscript.py" starts --
>
> fh = codecs.open("myfile.txt", "w", "utf8")
> fh.write("# Comment line\n")
> fh.writelines("some list")
> fh.flush()
> fh.close()
>
> then later:
>
> mycmd = "%s -f %s" % ("myscript.py", "myfile.txt")
> subprocess.call(mycmd, shell=True)
>
> This fails: "myfile.txt" is not yet written into disk
> and the "myscript.py" called thru subprocess fails.
> Only after the main script exits will "myfile.txt" occur
> into the directory.

this should of course work, and it sure works for me.

does this involve any unconventional file systems?  (file servers etc).

how much later is later ?

have you checked what the current directory is in all three cases?  (before
you create the file, before you call the script, and before you try to open the
file in the script).

</F>