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Showing content from https://mail.python.org/pipermail/python-dev/2009-January/085369.html below:

[Python-Dev] __del__ and tp_dealloc in the IO lib

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Guido van Rossum <guido <at> python.org> writes:
> 
> And, by the way, "for line in open(filename): ..." will continue to
> work. It may just not close the file right away. This is a forgivable
> sin in a small program that opens a few files only. It only becomes a
> program when this is itself inside a loop that loops over many
> filenames -- you could run out of file descriptors.

It can also be a problem under Windows where, IIRC, you can't delete a file
which is still opened somewhere (even for reading).

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