projects / OpenSPARC-T2-DV / blame
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| 57 | 6.21.4.6 Callback example 3: check option order (generalized) | |
| 58 | </H3> | |
| 59 | ||
| 60 | <P> | |
| 61 | If you want to re-use this callback for several similar options (set a | |
| 62 | flag, but blow up if <code>"-b"</code> has already been seen), it needs a bit of | |
| 63 | work: the error message and the flag that it sets must be | |
| 64 | generalized. | |
| 65 | <div class="verbatim"><pre> | |
| 66 | def check_order(option, opt_str, value, parser): | |
| 67 | if parser.values.b: | |
| 68 | raise OptionValueError("can't use %s after -b" % opt_str) | |
| 69 | setattr(parser.values, option.dest, 1) | |
| 70 | [...] | |
| 71 | parser.add_option("-a", action="callback", callback=check_order, dest='a') | |
| 72 | parser.add_option("-b", action="store_true", dest="b") | |
| 73 | parser.add_option("-c", action="callback", callback=check_order, dest='c') | |
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