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57 | 6.21.4.7 Callback example 4: check arbitrary condition | |
58 | </H3> | |
59 | ||
60 | <P> | |
61 | Of course, you could put any condition in there--you're not limited | |
62 | to checking the values of already-defined options. For example, if | |
63 | you have options that should not be called when the moon is full, all | |
64 | you have to do is this: | |
65 | <div class="verbatim"><pre> | |
66 | def check_moon(option, opt_str, value, parser): | |
67 | if is_moon_full(): | |
68 | raise OptionValueError("%s option invalid when moon is full" | |
69 | % opt_str) | |
70 | setattr(parser.values, option.dest, 1) | |
71 | [...] | |
72 | parser.add_option("--foo", | |
73 | action="callback", callback=check_moon, dest="foo") | |
74 | </pre></div> | |
75 | ||
76 | <P> | |
77 | (The definition of <code>is_moon_full()</code> is left as an exercise for the | |
78 | reader.) | |
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