14.3.2.7 Printing a version string
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")
"%prog" is expanded just like it is in usage. Apart
from that, version can contain anything you like. 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:
$ /usr/bin/foo --version foo 1.0
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Release 2.5, documentation updated on 19th September, 2006.