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| 1 | import optparse
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| 2 |
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| 3 | class OptionParser (optparse.OptionParser):
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| 4 |
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| 5 | def check_required (self, opt):
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| 6 | option = self.get_option(opt)
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| 7 |
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| 8 | # Assumes the option's 'default' is set to None!
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| 9 | if getattr(self.values, option.dest) is None:
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| 10 | self.error("%s option not supplied" % option)
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| 11 |
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| 12 |
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| 13 | parser = OptionParser()
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| 14 | parser.add_option("-v", action="count", dest="verbose")
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| 15 | parser.add_option("-f", "--file", default=None)
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| 16 | (options, args) = parser.parse_args()
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| 17 |
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| 18 | print "verbose:", options.verbose
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| 19 | print "file:", options.file
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| 20 | parser.check_required("-f")
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