optional args for getopt()
Richard Jones
richard at bizarsoftware.com.au
Wed Aug 22 23:37:46 EDT 2001
On Thursday 23 August 2001 12:59, bvdpoel at uniserve.com wrote:
> Is there a way to signal that the arg for getopt in optional. In C I can
> set an option string to something like:
>
> opts = "hg:b::"
>
> which means that 'g' needs an arg and that 'b' may have an arg. Seems
> the python routine is lacking??
>From the manual page on my Linux system,
"""
optstring is a string containing the legitimate option
characters. If such a character is followed by a colon,
the option requires an argument, so getopt places a
pointer to the following text in the same argv-element, or
the text of the following argv-element, in optarg. Two
colons mean an option takes an optional arg; if there is
text in the current argv-element, it is returned in
optarg, otherwise optarg is set to zero. This is a GNU
extension.
"""
Note "This is a GNU extension". I presume the POSIX standard doesn't require
it (don't have it handy). The python implementation will probably have been
written by someone working from the POSIX spec (or at least someone who was
working on a non-GNU-enhanced system :)
By all means, put in a feature/bug request on python.sf.net to have this
ammended for the next release.
Richard
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