Validating positional arguments in optparse

[Filip Gruszczyński]

optparse module is quite smart, when it comes to validating options,
like assuring, that certain option must be an integer. However, I
can't find any information about validating, that positional arguments
were provided and I can't find methods, that would allow defining
positional argument in OptionParser. Is it possible to do this, or was
it intentionaly left this way?

-- 
Filip Gruszczyński