positional arguments left out it the cold

Hello,

After using OptionParser for a while, I'm starting to wonder about 
something.  Why can't all of its features be applied to positional 
arguments just as well as options?  I have the same need for type 
checking, storage into a variable, callbacks, etc. with positional 
arguments as I do with options.

Why not rename the class to ArgumentParser and extend it to support 
positional args as it does options?

-John Belmonte



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