Bug#913274: Changing the _is_real_file() function

[Stuart Prescott]

Hi Colin,

Many years ago in doing the Python 2→3 port for python-debian, you wrote a
function to guard against giving file-like objects that were not file
handles to apt_pkg [1]. The reason I've been looking at this today is that 
the current check incorrectly identifies NamedTemporaryFile as not being
a real file, while apt_pkg is happy to accept such objects.

I *think* this can now be simplified as in the following commit, presumably
due to changes to the supported versions of Python we care about:

https://salsa.debian.org/python-debian-team/python-debian/merge_requests/8/diffs#89edc1b4f3188ea0d56566993279f0a9b5ad7c3a_298_298

I'd appreciate you checking my simplification, however, to make sure I've
not missed some case from the original code. (Also other co-maintainers!)

thanks,
Stuart

[1] https://salsa.debian.org/python-debian-team/python-debian/commit/43403ad82d16ca23a4f51af7e804cb2e201c58a4

-- 
Stuart Prescott    http://www.nanonanonano.net/   stuart at nanonanonano.net
Debian Developer   http://www.debian.org/         stuart at debian.org
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