6.20.2.5 Print a version number
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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