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139
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1 #!/usr/bin/env python
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2
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3 """
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4 illustrate which options are parsed with argparse
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5 """
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6
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7 import argparse
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8 import sys
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9
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141
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10 class Undefined(object):
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11 """singleton"""
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12
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13 Undefined = Undefined()
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14
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15 class UndefinedArgumentParser(argparse.ArgumentParser):
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16
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17 def add_argument(self, *args, **kwargs):
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18 kwargs.setdefault('default', Undefined)
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19 return argparse.ArgumentParser.add_argument
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139
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20
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21 def main(args=sys.argv[1:]):
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22
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23 parser = UndefinedArgumentParser()
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24 parser.add_argument('--foo', dest='foo',
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25 help="foo")
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26
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27 if __name__ == '__main__':
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28 main()
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