Apart from that, it wouldn't surprise me to learn that a "modern" windows OS is still having (or making) trouble when more than one process wants to open the same file, and one of those processes wants write access on the file.
(Have you tried putting print "starting now\n"; as the 3rd line, to see if you get any output at all before the error message?)
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Re^2: The process cannot access the file because it is being used by another process?
by BrowserUk (Pope) on Apr 28, 2016 at 02:53 UTC