projects / OpenSPARC-T2-SAM / blame
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| 55 | <H3><A NAME="SECTION0082145000000000000000"></A><A NAME="optparse-callback-example-2"></A> | |
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| 57 | 6.21.4.5 Callback example 2: check option order | |
| 58 | </H3> | |
| 59 | ||
| 60 | <P> | |
| 61 | Here's a slightly more interesting example: record the fact that | |
| 62 | <code>"-a"</code> is seen, but blow up if it comes after <code>"-b"</code> in the | |
| 63 | command-line. | |
| 64 | <div class="verbatim"><pre> | |
| 65 | def check_order(option, opt_str, value, parser): | |
| 66 | if parser.values.b: | |
| 67 | raise OptionValueError("can't use -a after -b") | |
| 68 | parser.values.a = 1 | |
| 69 | [...] | |
| 70 | parser.add_option("-a", action="callback", callback=check_order) | |
| 71 | parser.add_option("-b", action="store_true", dest="b") | |
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