6.20.2.2 Other store_* actions
Flag options--set a variable to true or false when a particular option is seen--are quite
common. optparse supports them with two separate actions, ``store_true''
and ``store_false''. For example, you might have a verbose flag that is turned on
with -v and off with -q:
parser.add_option("-v", action="store_true", dest="verbose")
parser.add_option("-q", action="store_false", dest="verbose")
Here we have two different options with the same destination, which is perfectly OK. (It
just means you have to be a bit careful when setting default values--see below.)
When optparse sees -v on the command
line, it sets options.verbose to True; when it sees -q, it sets options.verbose to False.
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