Steven Bethard <steven.beth...@gmail.com> added the comment:

The equivalent to optparse callback is basically to define __call__ in a 
subclass of Action. Pretty much the same amount of work because they both have 
complicated parameters.

The "callable" I (not fully confidently) proposed would just be a shorthand for 
defining __call__ in a subclass of Action when you don't care about any of the 
other command line info.

I guess, without further use cases for "callable" and given that you can 
subclass Action for other use cases, let's just do the action='write' version. 
Feel free to supply a patch, or I will when I get some time for argparse again.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9399>
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