sbt <shibt...@gmail.com> added the comment:

You are not doing anything to stop the file object being garbage collected (and 
therefore closed) before the mmap is created.  Try

import os
import mmap
f = open(<Certain File>,"r+")
size = os.path.getsize(<Certain File>))
data = mmap.mmap(f.fileno(), size)

----------
nosy: +sbt

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12882>
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