configargparse - reading option from config only

[Loris Bennett]

Hi,

When using configargparse, it seems that if a value is to be read from a
config file, it also has to be defined as a command-line argument in
order to turn up as an attribute in the parser namespace.  

I can sort of see why this is the case, but there are also some options
I would like to read just from the config file and not have them
available as command-line options.  This would be, say, to prevent the
number of options on the command-line from becoming bloated by
little-used settings.

Is there an elegant way to do this?

Cheers,

Loris

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