projects / OpenSPARC-T2-DV / blame
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| 55 | <H3><A NAME="SECTION0082148000000000000000"></A><A NAME="optparse-callback-example-5"></A> | |
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| 57 | 6.21.4.8 Callback example 5: fixed arguments | |
| 58 | </H3> | |
| 59 | ||
| 60 | <P> | |
| 61 | Things get slightly more interesting when you define callback options | |
| 62 | that take a fixed number of arguments. Specifying that a callback | |
| 63 | option takes arguments is similar to defining a <code>store</code> or <code>append</code> | |
| 64 | option: if you define <tt class="member">type</tt>, then the option takes one argument that | |
| 65 | must be convertible to that type; if you further define <code>nargs</code>, then | |
| 66 | the option takes <code>nargs</code> arguments. | |
| 67 | ||
| 68 | <P> | |
| 69 | Here's an example that just emulates the standard <code>store</code> action: | |
| 70 | <div class="verbatim"><pre> | |
| 71 | def store_value(option, opt_str, value, parser): | |
| 72 | setattr(parser.values, option.dest, value) | |
| 73 | [...] | |
| 74 | parser.add_option("--foo", | |
| 75 | action="callback", callback=store_value, | |
| 76 | type="int", nargs=3, dest="foo") | |
| 77 | </pre></div> | |
| 78 | ||
| 79 | <P> | |
| 80 | Note that <tt class="module">optparse</tt> takes care of consuming 3 arguments and converting them | |
| 81 | to integers for you; all you have to do is store them. (Or whatever; | |
| 82 | obviously you don't need a callback for this example.) | |
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