paul j3 added the comment:

The problem with the argparse backlog is that the original author of the module 
is too busy with other things.  And no one has stepped into his shoes.  There 
are people with experience in apply patches, and people who know the argparse 
code well, but few, if any with both skills (and/or the time to invest in this 
module).  

In addition the module has some serious backward compatibility issues.  I know 
of several patches that were applied, and then withdrawn because of unforseen 
(or at least untested) compatibility problems.  

While I commented earlier, I don't recall testing it.  I just tried it now, and 
ran into problems - until I realized this isn't compatible with Python2.7.  Py3 
is the development world, but there's still a lot of PY2 use (e.g look at 
Stackoverflow argparse questions).  On SO if people have problems with 
FileType, I often recommend that they just accept the filename, and take care 
of opening it themselves.  

To raise the attention to this patch I'd suggest 

- making the case that it is really needed

- demonstrating that it has been field tested, and is free of backward 
compatibility issues.

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<http://bugs.python.org/issue14156>
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