[issue22826] Support context management protocol in bkfile

[Raymond Hettinger]

Raymond Hettinger added the comment:

This looks correct and it improves readability.

One nit,  please put the doubled with on a single line instead of using the awkward line break (which looks weird with respect to the indentation of the with-block):

+    with open(config_c_in) as infp, bkfile.open(config_c, 'w') as outfp:

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nosy: +rhettinger

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22826>
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