Mitar <mmi...@gmail.com> added the comment:

Why not make FileType instance also a context manager, so you could do 
something like:

with arguments.input as f:
   assert arguments.input is f

For backwards compatibility, FileType would open eagerly as now, but it would 
be closed at exit from context manager.

We should just make sure we do not close stdout/stderr.

----------
nosy: +mitar

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue13824>
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