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Python Library Reference

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14.3.3.2 Populating the parser

There are several ways to populate the parser with options. Thepreferred way is by usingOptionParser.add_option(), as shown insection 14.3.2, the tutorial.add_option() can be called in one of twoways:

• pass it an Option instance (as returned bymake_option())

• pass it any combination of positional and keyword arguments that areacceptable tomake_option() (i.e., to the Option constructor),and it will create the Option instance for you

The other alternative is to pass a list of pre-constructed Optioninstances to the OptionParser constructor, as in:

option_list = [    make_option("-f", "--filename",                action="store", type="string", dest="filename"),    make_option("-q", "--quiet",                action="store_false", dest="verbose"),    ]parser = OptionParser(option_list=option_list)

(make_option() is a factory function for creating Option instances;currently it is an alias for the Option constructor. A future versionofoptparse may split Option into several classes, andmake_option()will pick the right class to instantiate. Do not instantiate Optiondirectly.)

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Python Library Reference

Previous:14.3.3.1 Creating the parserUp:14.3.3 Reference GuideNext:14.3.3.3 Defining options

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Release 2.5.2, documentation updated on 21st February, 2008.