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Similar to the brief usage string, optparse can also print a version string for your program. You have to supply the string, as the version argument to OptionParser:
parser = OptionParser(usage="%prog [-f] [-q]", version="%prog 1.0")
version can contain anything you like; %prog is expanded
in version just as with usage. When you supply it,
optparse automatically adds a --version option
to your parser. If it encounters this option on the command line, it
expands your version string (by replacing %prog), prints
it to stdout, and exits.
For example, if your script is called /usr/bin/foo, a user might do:
$ /usr/bin/foo --version foo 1.0
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