[issue4568] Improved optparse "varargs" callback example

[Gregg Lind]

New submission from Gregg Lind <gregg.lind at gmail.com>:

In the trunk (r67617) documentation for *optparse* callback example 6
doesn't handle negative number arguments, and fixing it is "left as an
exercise for the reader."  Well, I'm a reader, and I've attached my stab
at it.  Caveat: It relies in trying to coerce the argument into a
float... maybe there's a cleaner way to do it?

(This is my first patch, so I apologize if I've fouled it up in some
way, particularly in the headers of the patch format.)

----------
assignee: georg.brandl
components: Documentation
files: better_optparse_varargs_example.diff
keywords: patch
messages: 77185
nosy: georg.brandl, gregg.lind
severity: normal
status: open
title: Improved optparse "varargs" callback example
Added file: http://bugs.python.org/file12258/better_optparse_varargs_example.diff

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