Use opened files as context managers.

Thanks for the report and patch Ville. CPython development now uses GitHub PR instead of patches. It seems usages of this function was removed in 8b94b41ab7b12f745dea744e8940631318816935 during removal of platform.linux_distribution. This essentially seems to be unused code on master which I hope can be removed. So this patch is effective only for 3.7 and 3.6. Would you like to make a PR to take this forward?

No usages on master except definition.

➜  cpython git:(master) rg _dist_try_harder
Lib/platform.py
230:def _dist_try_harder(distname, version, id):


Thanks

I guess this can be closed as out of date since the function was removed with https://github.com/python/cpython/pull/10787/. 

cc: Victor

Python 3.6 and 3.7 are still supported. The patch LGTM, I converted it to a PR.

New changeset 7eeab87263b831adbe617a4af7ec5b5d9296962a by Victor Stinner in branch '3.7':
bpo-27903: Fix ResourceWarning in platform.dist() (GH-10792)
https://github.com/python/cpython/commit/7eeab87263b831adbe617a4af7ec5b5d9296962a

New changeset cbf57674e257617977b35c016e861a52b5f65359 by Miss Islington (bot) in branch '3.6':
bpo-27903: Fix ResourceWarning in platform.dist() (GH-10792)
https://github.com/python/cpython/commit/cbf57674e257617977b35c016e861a52b5f65359

Thanks Ville Skyttä for your bugfix! I applied it in 3.6 and 3.7 branches.

FYI as Karthikeyan Singaravelan wrote, the function is gone (I removed it) from the master branch ;-)

Ah sorry I forgot the previous versions that had this code. Thanks for the catch and PR victor :)

No problem, thanks for "cc-ing" me ;-)