source: trunk/essentials/dev-lang/python/Doc/lib/required_1.py@ 3368

Last change on this file since 3368 was 3225, checked in by bird, 19 years ago

Python 2.5

File size: 565 bytes
Line 
1import optparse
2
3class OptionParser (optparse.OptionParser):
4
5 def check_required (self, opt):
6 option = self.get_option(opt)
7
8 # Assumes the option's 'default' is set to None!
9 if getattr(self.values, option.dest) is None:
10 self.error("%s option not supplied" % option)
11
12
13parser = OptionParser()
14parser.add_option("-v", action="count", dest="verbose")
15parser.add_option("-f", "--file", default=None)
16(options, args) = parser.parse_args()
17
18print "verbose:", options.verbose
19print "file:", options.file
20parser.check_required("-f")
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