Enchancement suggestion for argparse: intuit type from default

[Roy Smith]

In article <4f612a9d$0$12033$742ec2ed at news.sonic.net>,
 John Nagle <nagle at animats.com> wrote:

> On 3/13/2012 2:08 PM, Roy Smith wrote:
> > Using argparse, if I write:
> >
> >      parser.add_argument('--foo', default=100)
> >
> > it seems like it should be able to intuit that the type of foo should
> > be int (i.e. type(default)) without my having to write:
> >
> >      parser.add_argument('--foo', type=int, default=100)
> >
> > Does this seem like a reasonable enhancement to argparse?
> 
>     default=None
> 
> presents some problems.

I'll admit I hadn't considered that, but I don't see it as a major 
problem.  The type intuition could be designed to only work for types 
other than NoneType.