[issue13824] argparse.FileType opens a file and never closes it

[Mitar]

Mitar <mmitar at 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.

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nosy: +mitar

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<https://bugs.python.org/issue13824>
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